CN110978667B - Silk screen material with singular Poisson ratio effect - Google Patents

Silk screen material with singular Poisson ratio effect Download PDF

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CN110978667B
CN110978667B CN201911255013.2A CN201911255013A CN110978667B CN 110978667 B CN110978667 B CN 110978667B CN 201911255013 A CN201911255013 A CN 201911255013A CN 110978667 B CN110978667 B CN 110978667B
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silk screen
longitudinal
silk
screens
layer
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CN110978667A (en
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马军
王建忠
敖庆波
李烨
康新婷
吴琛
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Northwest Institute for Non Ferrous Metal Research
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Northwest Institute for Non Ferrous Metal Research
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/02—Layer formed of wires, e.g. mesh
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/028—Net structure, e.g. spaced apart filaments bonded at the crossing points
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/10—Interconnection of layers at least one layer having inter-reactive properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres

Abstract

The invention discloses a silk screen material with a singular Poisson ratio effect, which consists of 3-26 silk screen units, wherein each silk screen unit consists of a first silk screen layer and a second silk screen layer which are symmetrical along an x-y plane, each first silk screen layer consists of a longitudinal silk screen which is distributed along the y direction and is bent in a wave shape and a transverse silk screen which is sequentially arranged in the wave crest and the wave trough of the longitudinal silk screen in a penetrating manner, the vertical distances of the wave crest and the wave trough of the longitudinal silk screen in the first silk screen layer and the second silk screen layer at the central position of the silk screen material are equal and are smaller than the non-central position, and the silk screen material is prepared by sintering or bonding. The contact points between the wires of the silk screen material are weak bonding points, and the deformation of the wires is less limited when the wires are longitudinally stretched or compressed, so that the wires can be further deformed, and therefore the Poisson ratio of the silk screen material is negative when the silk screen material is stretched and positive when the silk screen material is compressed, the problem that the existing silk screen material only has a single Poisson ratio is solved, and the wire mesh material can be applied to a strain amplifier.

Description

Silk screen material with singular Poisson ratio effect
Technical Field
The invention belongs to the technical field of production of silk screens, and particularly relates to a silk screen material with a singular Poisson ratio effect.
Background
The strain amplifier material has the effect of converting weak longitudinal vibration into strong transverse vibration, requires the material to generate obvious transverse deformation when longitudinally extending or contracting, and has a larger absolute value of Poisson ratio, and the Poisson ratio is expressed as follows: v = -z/xWherein v is the Poisson's ratio,zis a transverse strain in the thickness direction in the elastic phase,xis the longitudinal strain in the in-plane direction of the elastic phase.
The strain amplifier material is usually a negative poisson ratio material, but when the strain amplifier material is applied to induced vibration, vibration waves need to be converted according to conditions, so that the strain amplifier material needs a material with a negative poisson ratio in stretching and compression and a material with an opposite poisson ratio in stretching and compression, and a common material has a positive poisson ratio or a negative poisson ratio in stretching and compression and has a phenomenon of very little opposite poisson ratios.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a silk screen material with singular poisson ratio effect, aiming at the defects of the prior art. In the silk screen material with the singular Poisson's ratio effect prepared by the invention, the vertical distance between the wave crest and the wave trough of the longitudinal silk screen in the first silk screen layer at the central position is equal to the vertical distance between the wave crest and the wave trough of the longitudinal silk screen in the second silk screen layer and is smaller than the vertical distance between the wave crest and the wave trough of the longitudinal silk screen at the non-central position, through sintering treatment or bonding treatment, weak bonding points are formed among the wires of the silk screen material to obtain the silk screen material with the singular Poisson ratio effect, when the silk screen is longitudinally stretched or longitudinally compressed, the deformation of the silk is less limited, the silk screen can further deform, the positive Poisson ratio effect of the silk screen material with the singular Poisson ratio effect is realized when the silk screen material is compressed, the negative Poisson ratio effect is generated during stretching, and the problem that the conventional silk screen material does not generate the negative Poisson ratio effect or only generates the negative Poisson ratio effect is solved.
In order to solve the technical problems, the invention adopts the technical scheme that: the silk screen material with the singular Poisson ratio effect is characterized by being formed by stacking 3-26 silk screen units, each silk screen unit is formed by stacking a first silk screen layer and a second silk screen layer which are symmetrical along an x-y plane, each first silk screen layer is formed by longitudinal silk screens which are distributed along a y direction and are bent in a wave shape and transverse silk screens which are sequentially arranged in peaks and troughs of the longitudinal silk screens in a penetrating mode, the transverse silk screens are in contact with the peaks and the troughs of the longitudinal silk screens, the adjacent first silk screen layers are in contact with the transverse silk screens in the second silk screen layers, the longitudinal silk screens of the first silk screen layers at the center of the silk screen material are not in contact with the longitudinal silk screens of the adjacent second silk screen layers, the longitudinal silk screens of the second silk screen layers at the center of the silk screen material are not in contact with the longitudinal silk screen layers of the adjacent first silk screen layers, and the vertical distances between the peaks and the troughs of the longitudinal silk screen layers in the first silk screen layers at the center of the silk screen The vertical distances of the wave crests and the wave troughs of the longitudinal silk screen in the second silk screen layer are equal and are 1.5 d-1.9 d, the vertical distances of the wave crests and the wave troughs of the longitudinal silk screen in the first silk screen layer at the non-central position are equal to the vertical distances of the wave crests and the wave troughs of the longitudinal silk screen in the second silk screen layer and are 2d, wherein d is the diameter of a single silk in the transverse silk screen and the longitudinal silk screen;
the silk screen material is prepared by the following steps:
step one, weaving the silk to obtain a woven silk screen;
step two, heating the woven silk screen obtained in the step one to 800-1000 ℃, preserving heat for 5-20 min, and sintering to obtain a silk screen material, or adopting 0.05mol/L PVA solution to perform bonding treatment on the woven silk screen obtained in the step one in the usage amount of 0.1-0.3 g of woven silk screen per square centimeter to obtain the silk screen material; the mesh material has a negative poisson's ratio when longitudinally stretched and a positive poisson's ratio when longitudinally compressed.
The silk screen material with the singular Poisson ratio effect is characterized in that the horizontal distance between adjacent peaks and troughs in the longitudinal silk screen in the first silk screen layer is equal to the horizontal distance between adjacent peaks and troughs in the longitudinal silk screen in the second silk screen layer and is 4 d-8 d. According to the invention, the horizontal distance between the adjacent peaks and troughs in the longitudinal silk screen in the first silk screen layer is equal to the horizontal distance between the adjacent peaks and troughs in the longitudinal silk screen in the second silk screen layer and is 4 d-8 d, so that the silk screen material with the singular Poisson ratio effect has a proper Poisson ratio, and the defects that the positive Poisson ratio or negative Poisson ratio effect is too weak due to the fact that the horizontal distance between the adjacent peaks and troughs in the longitudinal silk screen is too small, or the strain range of the Poisson ratio effect is too small and the Poisson ratio effect is not obvious due to the fact that the horizontal distance between the adjacent peaks and troughs in the longitudinal silk screen layer is too large are avoided.
The silk screen material with the singular poisson ratio effect is characterized in that single wires in the transverse silk screen and the longitudinal silk screen are epoxy resin wires or stainless steel wires, wherein the diameter d =8 μm-1000 μm of the single wire. According to the invention, the single wires in the transverse wire mesh and the longitudinal wire mesh are epoxy resin wires or stainless steel wires, so that the wire mesh has proper strength, longitudinal and transverse cooperative deformation is favorably generated during longitudinal stretching and longitudinal compression, the wire mesh material has a negative Poisson ratio during longitudinal stretching, and a singular Poisson ratio effect of a positive Poisson ratio during longitudinal compression, and the diameter d = 8-1000 μm of the single wire is adopted, so that the obtained wire mesh material with the singular Poisson ratio effect has proper transverse deformation when being subjected to longitudinal stretching and longitudinal compression, and the defects of small transverse deformation, low tensile strength and the like caused by too large or too small diameter are avoided.
The principle of the silk screen with the singular Poisson ratio effect is as follows: the silk screen material with the singular Poisson ratio effect prepared by the invention has the advantages that when the silk screen material is longitudinally stretched in the y and-y directions, the y-direction wires in the silk screen material tend to be straightened, the deformation of the y-direction wires is less limited due to low strength of the bonding points, the y-direction wires become straighter when the whole silk screen material is stretched, the y-direction wires on the upper and lower side edges of the silk screen material are pushed to the outer side by the y-direction wires in the central position and exceed the boundary of the silk screen material, so that the whole silk screen material is greatly transversely expanded, the obvious negative Poisson ratio effect is generated, when the y and-y directions are longitudinally compressed, the y-direction wires in the silk screen material tend to be bent, and because the strength of the bonding points is low, the deformation of the y-direction wires is less limited, and when the whole silk screen material is compressed, the y-direction wires are further bent, the y-direction wire at the center of the bend contacts with the adjacent y-direction wire at the peak position, and the y-direction wires at the upper and lower edges are pushed outwards to push the y-direction wires out of the boundaries of the silk screen material, so that the whole silk screen material is expanded transversely, and an obvious positive Poisson ratio effect is generated.
Compared with the prior art, the invention has the following advantages:
1. in the silk screen material with the singular poisson ratio effect, the vertical distance between the wave crest and the wave trough of the longitudinal silk screen in the first silk screen layer at the central position is equal to the vertical distance between the wave crest and the wave trough of the longitudinal silk screen in the second silk screen layer and is smaller than the vertical distance between the wave crest and the wave trough of the longitudinal silk screen at the non-central position, the sintering treatment or the bonding treatment is adopted, so that the contact points between the wires of the silk screen material with the singular poisson ratio effect are combined very weakly to form weak combination points, the deformation of the wires is less limited when the wires are longitudinally stretched or longitudinally compressed, the wires can be further deformed, the silk screen material with the singular poisson ratio effect generates the positive poisson ratio effect when being compressed and generates the negative poisson ratio effect when being stretched, and the problems that the traditional silk screen material does not generate the negative poisson ratio effect or only generates the negative poisson ratio effect are solved, a new method is provided for manufacturing a screen with the singular poisson's ratio effect.
2. The invention adopts high-temperature sintering treatment or bonding treatment to ensure that the contact points of the prepared silk screen material are chemically or physically combined, thereby realizing the preparation of the silk screen material with singular Poisson's ratio effect.
3. The screen printing machine is formed by stacking 3-26 screen units, so that the defect that the singular Poisson ratio effect cannot be generated due to too thin or too thick screen materials caused by too few or too many screen units is avoided; the vertical distances between the wave crests and the wave troughs of the longitudinal silk screen in the first silk screen layer 1 at the central position of the silk screen material are equal to and are 1.5 d-1.9 d respectively, the vertical distances between the wave crests and the wave troughs of the longitudinal silk screen in the first silk screen layer 1 at the non-central position are equal to and are 2d respectively, so that the negative Poisson's ratio of the silk screen material during longitudinal stretching is realized, the special Poisson ratio effect of positive Poisson ratio is achieved during longitudinal compression, and the defect that the special Poisson ratio effect cannot be achieved in cooperation with the fact that the vertical distance between the wave crest and the wave trough of the longitudinal silk screen in the first silk screen layer 1 and the second silk screen layer 2 at the center position is consistent with the non-center position, and the Poisson ratio is close to 0 during longitudinal stretching and longitudinal compression is caused is avoided.
4. The preparation method is simple in preparation process, easy to realize and suitable for large-scale production.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic representation of a 316L stainless steel wire mesh material having the singular Poisson ratio effect prepared in example 1 of the present invention.
Figure 2 is a schematic representation of longitudinal stretching of a 316L stainless steel wire mesh material having the singular poisson's ratio effect produced in example 1 of the present invention.
Figure 3 is a schematic representation of longitudinal compression of 316L stainless steel wire mesh material having the singular poisson's ratio effect prepared in example 1 of the present invention.
Description of reference numerals:
1-a first silk screen layer; 2-a second silk screen layer; 3-center position;
4-the individual wires that make up the transverse wire mesh; 5-single wires forming the longitudinal wire mesh;
Detailed Description
Example 1
The silk screen material with the singular poisson's ratio effect of the embodiment is formed by stacking 3 silk screen units, each silk screen unit is formed by stacking a first silk screen layer 1 and a second silk screen layer 2 which are symmetrical along an x-y plane, each first silk screen layer 1 is formed by a longitudinal silk screen which is arranged along a y direction and is bent in a wave shape and transverse silk screens which are sequentially arranged in peaks and valleys of the longitudinal silk screens, the transverse silk screens are contacted with the peaks and valleys of the longitudinal silk screens, adjacent first silk screen layers 1 are contacted with the transverse silk screens in the second silk screen layers 2, the longitudinal silk screens of the first silk screen layers 1 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent second silk screen layers 2, the longitudinal silk screens of the second silk screen layers 2 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent first silk screen layers 1, and vertical distances of the peaks and the valleys of the longitudinal silk screens in the first silk screen layers 1 in the central position of the silk screen material The vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the silk screen layers 2 are equal and are both 1.5d, the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the first silk screen layer 1 at the non-central position are equal and are both 2d with the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the second silk screen layer 2, the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the first silk screen layer 1 are equal and are both 4d with the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the second silk screen layer 2, wherein d =28 μm is the diameter of a single silk in each of the transverse silk screens and the longitudinal silk screens;
the silk screen material is prepared by the following steps:
step one, weaving 316L stainless steel wires with the diameter d =28 μm to obtain a woven 316L stainless steel wire mesh;
and step two, heating the woven 316L stainless steel wire mesh obtained in the step one to 900 ℃, preserving the temperature for 10min, and sintering to obtain a 316L stainless steel wire mesh material with a singular Poisson ratio effect.
It was determined that the 316L stainless steel wire mesh material prepared in this example, having the singular poisson's ratio effect, had a poisson ratio of-15.12 when longitudinally strained to 0.0078 when longitudinally stretched in the y and-y directions and 2.16 when longitudinally strained to 0.024 when longitudinally compressed in the y and-y directions.
Fig. 1 is a schematic diagram of a 316L stainless steel wire mesh material with singular poisson's ratio effect prepared in this embodiment, as can be seen from fig. 1, a dotted frame in the diagram represents a boundary of the 316L stainless steel wire mesh material, the 316L stainless steel wire mesh material with singular poisson's ratio effect prepared in this embodiment is composed of a stack of 3 wire mesh units, each of which is composed of a stack of a first wire mesh layer 1 and a second wire mesh layer 2 which are symmetrical along an x-y plane, the first wire mesh layer 1 is composed of longitudinal wire meshes which are arranged in a y direction and are bent in a wave shape, and transverse wire meshes which are sequentially inserted into peaks and valleys of the longitudinal wire meshes, the transverse wire meshes are in contact with the peaks and valleys of the longitudinal wire meshes, an adjacent first wire mesh layer 1 is in contact with the transverse wire meshes in the second wire mesh layer 2, the longitudinal wire mesh layer of the first wire mesh layer 1 at a central position of the wire mesh material is not in contact with the adjacent longitudinal wire mesh, the longitudinal silk screen of the second silk screen layer 2 at the central position 3 of the silk screen material is not contacted with the longitudinal silk screen of the adjacent first silk screen layer 1, the vertical distance between the wave crest and the wave trough of the longitudinal silk screen of the first silk screen layer 1 at the central position of the silk screen material is equal to the vertical distance between the wave crest and the wave trough of the longitudinal silk screen of the second silk screen layer 2 and is 1.5d, the vertical distance between the wave crest and the wave trough of the longitudinal silk screen of the first silk screen layer 1 at the non-central position is equal to the vertical distance between the wave crest and the wave trough of the longitudinal silk screen of the second silk screen layer 2 and is 2d, the horizontal distance between the adjacent wave crest and the wave trough of the longitudinal silk screen of the first silk screen layer 1 is equal to the horizontal distance between the adjacent wave crest and wave trough of the longitudinal silk screen of the second silk screen layer 2, where d =28 μm is the diameter of the individual wires 4 making up the transverse wire mesh and the individual wires 5 making up the longitudinal wire mesh.
FIG. 2 is a schematic diagram of the 316L stainless steel mesh material with singular Poisson's ratio effect prepared in this example, as can be seen from FIG. 2, the dashed boxes in the figure represent the boundary of the 316L stainless steel mesh material before stretching, the black arrows represent the longitudinal stretching in the y and-y directions, when the 316L stainless steel mesh material is longitudinally stretched in the y and-y directions, the 316L stainless steel wires in the y direction in the 316L stainless steel mesh material have a tendency to be straightened, and the deformation of the 316L stainless steel wires in the y direction is less limited due to the low strength of the bonding points, when the 316L stainless steel mesh material is stretched as a whole, the 316L stainless steel wires in the y direction become straighter, and the 316L stainless steel wires in the y direction of the upper and lower side edges are pushed to the outside by the middle two 316L stainless steel wires in the y direction and exceed the boundary of the 316L stainless steel mesh material, resulting in a large lateral expansion of the whole 316L stainless steel mesh material, resulting in a significant negative poisson's ratio effect.
Fig. 3 is a schematic diagram of the 316L stainless steel mesh material with singular poisson's ratio effect prepared in this embodiment, as can be seen from fig. 3, the dashed boxes in the diagram represent the boundaries of the 316L stainless steel mesh material before compression, the black arrows represent longitudinal stretching in the y and-y directions, when the 316L stainless steel mesh material is longitudinally compressed in the y and-y directions, the 316L stainless steel wires in the y direction in the 316L stainless steel mesh material have a tendency to be buckled, and due to low strength of the bonding points, the deformation of the 316L stainless steel wires in the y direction is less limited, when the 316L stainless steel mesh material is compressed in its entirety, the 316L stainless steel wires in the y direction are further bent, and the 316L stainless steel wires in the middle two y directions in the bent state are contacted with the 316L stainless steel wires in the y direction at peak positions, the stainless steel wires 316L in the y direction at the upper and lower side edges are pushed outwards to push out the boundary of the stainless steel wire mesh material 316L, so that the stainless steel wire mesh material 316L is greatly expanded transversely, and an obvious positive Poisson ratio effect is generated.
As can be seen from fig. 2 and 3, the 316L stainless steel mesh material with singular poisson's ratio effect prepared by the present example shows negative poisson's ratio when the prepared 316L stainless steel mesh material is subjected to longitudinal stretching and positive poisson's ratio when the material is subjected to longitudinal compression.
Comparative example 1
This comparative example differs from example 1 in that: the vertical distance between the wave crest and the wave trough of the longitudinal silk screen in the first silk screen layer 1 at the center of the silk screen material is equal to the vertical distance between the wave crest and the wave trough of the longitudinal silk screen in the second silk screen layer 2 and is 2 d.
The 316L stainless steel wire mesh material prepared in this comparative example was tested to have a poisson ratio of-0.12 when machine direction strain was 0.0078 when machine direction stretched in the y and-y directions and 0 when machine direction strain was 0.024 when machine direction compressed in the y and-y directions.
As can be seen by comparing comparative example 1 with example 1, when the vertical distance of the peaks and valleys of the longitudinal wires in the first wire layer 1 and the second wire layer 2 at the center of the wire material is more than 1.9d, the wire material prepared does not have the singular poisson's ratio effect.
Comparative example 2
This comparative example differs from example 1 in that: the vertical distances of the wave crests and the wave troughs of the longitudinal silk screen in the first silk screen layer 1 at the center of the silk screen material are equal to the vertical distances of the wave crests and the wave troughs of the longitudinal silk screen in the second silk screen layer 2 and are d.
The 316L stainless steel wire mesh material prepared in this comparative example was tested to have a poisson ratio of-0.13 when machine direction strain was 0.0078 when machine direction stretched in the y and-y directions and 0 when machine direction strain was 0.024 when machine direction compressed in the y and-y directions.
As can be seen by comparing comparative example 2 with example 1, when the vertical distance of the peaks and valleys of the longitudinal wires in the first wire layer 1 and the second wire layer 2 at the center of the wire material is less than 1.5d, the wire material prepared does not have the singular poisson's ratio effect.
Comparing comparative example 1 and comparative example 2 with example 1, it can be seen that when the vertical distance of the peaks and valleys of the longitudinal wires in the first wire mesh layer 1 and the second wire mesh layer 2 at the center of the wire mesh material is in the range of 1.5d to 1.9d, the prepared wire mesh material can have the singular poisson's ratio effect.
Comparative example 3
This comparative example differs from example 1 in that: the screen material consists of a stack of 30 screen units.
The 316L stainless steel wire mesh material prepared in this comparative example was tested to have a poisson ratio of-0.07 when machine direction strain was 0.0078 when machine direction stretched in the y and-y directions and 0 when machine direction strain was 0.024 when machine direction compressed in the y and-y directions.
As can be seen by comparing comparative example 3 with example 1, when the screen material consists of a stack of more than 26 screen units, the screen material prepared does not have the singular poisson's ratio effect.
Example 2
The silk screen material with the singular poisson's ratio effect of the embodiment is formed by stacking 3 silk screen units, each silk screen unit is formed by stacking a first silk screen layer 1 and a second silk screen layer 2 which are symmetrical along an x-y plane, each first silk screen layer 1 is formed by a longitudinal silk screen which is arranged along a y direction and is bent in a wave shape and transverse silk screens which are sequentially arranged in peaks and valleys of the longitudinal silk screens, the transverse silk screens are contacted with the peaks and valleys of the longitudinal silk screens, adjacent first silk screen layers 1 are contacted with the transverse silk screens in the second silk screen layers 2, the longitudinal silk screens of the first silk screen layers 1 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent second silk screen layers 2, the longitudinal silk screens of the second silk screen layers 2 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent first silk screen layers 1, and vertical distances of the peaks and the valleys of the longitudinal silk screens in the first silk screen layers 1 in the central position of the silk screen material The vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the silk screen layers 2 are equal and are both 1.5d, the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the first silk screen layer 1 at the non-central position are equal and are both 2d with the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the second silk screen layer 2, the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the first silk screen layer 1 are equal and are both 4d with the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the second silk screen layer 2, wherein d =28 μm is the diameter of a single silk in each of the transverse silk screens and the longitudinal silk screens;
the silk screen material is prepared by the following steps:
step one, weaving 316L stainless steel wires with the diameter d =28 μm to obtain a woven 316L stainless steel wire mesh;
and step two, adopting 0.05mol/L PVA solution to weave the 316L stainless steel wire mesh obtained in the step one, and carrying out bonding treatment on the woven wire mesh obtained in the step one by using 0.1g of the 316L stainless steel wire mesh woven in each square centimeter to obtain a 316L stainless steel wire mesh material with the singular Poisson ratio effect.
It was determined that the 316L stainless steel wire mesh material prepared in this example, having the singular poisson's ratio effect, had a poisson ratio of-9.15 when machine direction strain was 0.0078 when machine direction stretched in the y and-y directions and a poisson ratio of 2.98 when machine direction strain was 0.024 when machine direction compressed in the y and-y directions.
Comparative example 4
This comparative example differs from example 2 in that: the vertical distance between the wave crest and the wave trough of the longitudinal silk screen in the first silk screen layer 1 at the center of the silk screen material is equal to the vertical distance between the wave crest and the wave trough of the longitudinal silk screen in the second silk screen layer 2 and is 2 d.
The 316L stainless steel wire mesh material prepared in this comparative example was tested to have a poisson ratio of-0.11 when machine direction strain was 0.0078 when machine direction stretched in the y and-y directions and 0 when machine direction strain was 0.024 when machine direction compressed in the y and-y directions.
As can be seen by comparing comparative example 4 with example 2, when the vertical distance of the peaks and valleys of the longitudinal wires in the first wire layer 1 and the second wire layer 2 at the center of the wire material is more than 1.9d, the wire material prepared does not have the singular poisson's ratio effect.
Comparative example 5
This comparative example differs from example 2 in that: the vertical distances of the wave crests and the wave troughs of the longitudinal silk screen in the first silk screen layer 1 at the center of the silk screen material are equal to the vertical distances of the wave crests and the wave troughs of the longitudinal silk screen in the second silk screen layer 2 and are d.
The 316L stainless steel wire mesh material prepared in this comparative example was tested to have a poisson ratio of-0.08 when machine direction strain was 0.0078 when machine direction stretched in the y and-y directions and 0 when machine direction strain was 0.024 when machine direction compressed in the y and-y directions.
As can be seen by comparing comparative example 5 with example 2, when the vertical distance of the peaks and valleys of the longitudinal wires in the first wire layer 1 and the second wire layer 2 at the center of the wire material is less than 1.5d, the wire material prepared does not have the singular poisson's ratio effect.
Comparing comparative example 4 and comparative example 5 with example 2, it can be seen that when the vertical distance of the peaks and valleys of the longitudinal wires in the first wire mesh layer 1 and the second wire mesh layer 2 at the center of the wire mesh material is in the range of 1.5d to 1.9d, the prepared wire mesh material can have the singular poisson's ratio effect.
Comparative example 6
This comparative example differs from example 2 in that: the screen material consists of a stack of 30 screen units.
The 316L stainless steel wire mesh material prepared in this comparative example was tested to have a poisson ratio of-0.05 when machine direction strain was 0.0078 when machine direction stretched in the y and-y directions and 0 when machine direction strain was 0.024 when machine direction compressed in the y and-y directions.
As can be seen by comparing comparative example 6 with example 2, when the screen material consists of a stack of more than 26 screen units, the screen material prepared does not have the singular poisson's ratio effect.
Example 3
The silk screen material with the singular poisson's ratio effect of the embodiment is formed by stacking 3 silk screen units, each silk screen unit is formed by stacking a first silk screen layer 1 and a second silk screen layer 2 which are symmetrical along an x-y plane, each first silk screen layer 1 is formed by a longitudinal silk screen which is arranged along a y direction and is bent in a wave shape and transverse silk screens which are sequentially arranged in peaks and valleys of the longitudinal silk screens, the transverse silk screens are contacted with the peaks and valleys of the longitudinal silk screens, adjacent first silk screen layers 1 are contacted with the transverse silk screens in the second silk screen layers 2, the longitudinal silk screens of the first silk screen layers 1 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent second silk screen layers 2, the longitudinal silk screens of the second silk screen layers 2 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent first silk screen layers 1, and vertical distances of the peaks and the valleys of the longitudinal silk screens in the first silk screen layers 1 in the central position of the silk screen material The vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the silk screen layers 2 are equal and are both 1.9d, the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the first silk screen layer 1 at the non-central position are equal and are both 2d with the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the second silk screen layer 2, the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the first silk screen layer 1 are equal and are both 4d with the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the second silk screen layer 2, wherein d =500 μm is the diameter of a single silk in each of the transverse silk screens and the longitudinal silk screens;
the silk screen material is prepared by the following steps:
step one, weaving 316L stainless steel wires with the diameter d =500 μm to obtain a woven 316L stainless steel wire mesh;
and step two, heating the woven 316L stainless steel wire mesh obtained in the step one to 1000 ℃, preserving the temperature for 5min, and sintering to obtain a 316L stainless steel wire mesh material with a singular Poisson ratio effect.
It was determined that the 316L stainless steel wire mesh material prepared in this example, having the singular poisson's ratio effect, had a poisson ratio of-13.12 when longitudinally strained to 0.0078 when longitudinally stretched in the y and-y directions and 2.12 when longitudinally strained to 0.024 when longitudinally compressed in the y and-y directions.
Example 4
The silk screen material with the singular poisson's ratio effect of the embodiment is formed by stacking 3 silk screen units, each silk screen unit is formed by stacking a first silk screen layer 1 and a second silk screen layer 2 which are symmetrical along an x-y plane, each first silk screen layer 1 is formed by a longitudinal silk screen which is arranged along a y direction and is bent in a wave shape and transverse silk screens which are sequentially arranged in peaks and valleys of the longitudinal silk screens, the transverse silk screens are contacted with the peaks and valleys of the longitudinal silk screens, adjacent first silk screen layers 1 are contacted with the transverse silk screens in the second silk screen layers 2, the longitudinal silk screens of the first silk screen layers 1 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent second silk screen layers 2, the longitudinal silk screens of the second silk screen layers 2 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent first silk screen layers 1, and vertical distances of the peaks and the valleys of the longitudinal silk screens in the first silk screen layers 1 in the central position of the silk screen material The vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the silk screen layers 2 are equal and are both 1.7d, the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the first silk screen layer 1 at the non-central position are equal and are both 2d with the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the second silk screen layer 2, the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the first silk screen layer 1 are equal and are both 6d with the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the second silk screen layer 2, wherein d =8 μm is the diameter of a single silk in each of the transverse silk screens and the longitudinal silk screens;
the silk screen material is prepared by the following steps:
step one, weaving 316L stainless steel wires with the diameter d =8 μm to obtain a woven 316L stainless steel wire mesh;
and step two, heating the woven 316L stainless steel wire mesh obtained in the step one to 800 ℃, preserving the temperature for 20min, and sintering to obtain a 316L stainless steel wire mesh material with a singular Poisson ratio effect.
It was determined that the 316L stainless steel wire mesh material prepared in this example, having the singular poisson's ratio effect, had a poisson ratio of-9.35 when machine direction strain was 0.0078 when machine direction stretched in the y and-y directions and a poisson ratio of 2.38 when machine direction strain was 0.024 when machine direction compressed in the y and-y directions.
Example 5
The silk screen material with the singular poisson's ratio effect of the embodiment is formed by stacking 11 silk screen units, each silk screen unit is formed by stacking a first silk screen layer 1 and a second silk screen layer 2 which are symmetrical along an x-y plane, each first silk screen layer 1 is formed by a longitudinal silk screen which is arranged along a y direction and is bent in a wave shape and transverse silk screens which are sequentially arranged in peaks and valleys of the longitudinal silk screens, the transverse silk screens are contacted with the peaks and valleys of the longitudinal silk screens, adjacent first silk screen layers 1 are contacted with the transverse silk screens in the second silk screen layers 2, the longitudinal silk screens of the first silk screen layers 1 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent second silk screen layers 2, the longitudinal silk screens of the second silk screen layers 2 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent first silk screen layers 1, and vertical distances of the peaks and the valleys of the longitudinal silk screens in the first silk screen layers 1 in the central position of the silk screen material The vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the silk screen layers 2 are equal and are both 1.6d, the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the first silk screen layer 1 at the non-central position are equal and are both 2d with the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the second silk screen layer 2, the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the first silk screen layer 1 are equal and are both 8d with the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the second silk screen layer 2, wherein d =500 μm is the diameter of a single silk in each of the transverse silk screens and the longitudinal silk screens;
the silk screen material is prepared by the following steps:
step one, weaving 316L stainless steel wires with the diameter d =500 μm to obtain a woven 316L stainless steel wire mesh;
and step two, heating the woven 316L stainless steel wire mesh obtained in the step one to 900 ℃, preserving the temperature for 10min, and sintering to obtain a 316L stainless steel wire mesh material with a singular Poisson ratio effect.
It was determined that the 316L stainless steel wire mesh material prepared in this example, having the singular poisson's ratio effect, had a poisson ratio of-14.12 when the longitudinal strain was 0.0078 when stretched longitudinally in the y and-y directions and 2.26 when the longitudinal strain was 0.024 when compressed longitudinally in the y and-y directions.
Example 6
The silk screen material with the singular poisson's ratio effect of the embodiment is formed by stacking 3 silk screen units, each silk screen unit is formed by stacking a first silk screen layer 1 and a second silk screen layer 2 which are symmetrical along an x-y plane, each first silk screen layer 1 is formed by a longitudinal silk screen which is arranged along a y direction and is bent in a wave shape and transverse silk screens which are sequentially arranged in peaks and valleys of the longitudinal silk screens, the transverse silk screens are contacted with the peaks and valleys of the longitudinal silk screens, adjacent first silk screen layers 1 are contacted with the transverse silk screens in the second silk screen layers 2, the longitudinal silk screens of the first silk screen layers 1 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent second silk screen layers 2, the longitudinal silk screens of the second silk screen layers 2 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent first silk screen layers 1, and vertical distances of the peaks and the valleys of the longitudinal silk screens in the first silk screen layers 1 in the central position of the silk screen material The vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the silk screen layers 2 are equal and are both 1.6d, the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the first silk screen layer 1 at the non-central position are equal and are both 2d with the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the second silk screen layer 2, the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the first silk screen layer 1 are equal and are both 7d with the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the second silk screen layer 2, wherein d =1000 μm is the diameter of a single silk in each of the transverse silk screens and the longitudinal silk screens;
the silk screen material is prepared by the following steps:
step one, weaving 316L stainless steel wires with the diameter d =1000 μm to obtain a woven 316L stainless steel wire mesh;
and step two, heating the woven 316L stainless steel wire mesh obtained in the step one to 900 ℃, preserving the temperature for 20min, and sintering to obtain a 316L stainless steel wire mesh material with a singular Poisson ratio effect.
It was determined that the 316L stainless steel wire mesh material prepared in this example, having the singular poisson's ratio effect, had a poisson ratio of-9.45 when longitudinally strained to 0.0078 when longitudinally stretched in the y and-y directions and 2.08 when longitudinally strained to 0.024 when longitudinally compressed in the y and-y directions.
Example 7
The silk screen material with the singular poisson's ratio effect of the embodiment is formed by stacking 3 silk screen units, each silk screen unit is formed by stacking a first silk screen layer 1 and a second silk screen layer 2 which are symmetrical along an x-y plane, each first silk screen layer 1 is formed by a longitudinal silk screen which is arranged along a y direction and is bent in a wave shape and transverse silk screens which are sequentially arranged in peaks and valleys of the longitudinal silk screens, the transverse silk screens are contacted with the peaks and valleys of the longitudinal silk screens, adjacent first silk screen layers 1 are contacted with the transverse silk screens in the second silk screen layers 2, the longitudinal silk screens of the first silk screen layers 1 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent second silk screen layers 2, the longitudinal silk screens of the second silk screen layers 2 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent first silk screen layers 1, and vertical distances of the peaks and the valleys of the longitudinal silk screens in the first silk screen layers 1 in the central position of the silk screen material The vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the silk screen layers 2 are equal and are both 1.5d, the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the first silk screen layer 1 at the non-central position are equal and are both 2d with the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the second silk screen layer 2, the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the first silk screen layer 1 are equal and are both 4d with the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the second silk screen layer 2, wherein d =28 μm is the diameter of a single silk in each of the transverse silk screens and the longitudinal silk screens;
the silk screen material is prepared by the following steps:
step one, weaving epoxy resin wires with the diameter d =28 μm to obtain a woven epoxy resin wire mesh;
and step two, adopting 0.05mol/L PVA solution to the woven epoxy resin silk screen obtained in the step one, and carrying out bonding treatment on the woven epoxy resin silk screen obtained in the step one by using the amount of 0.3g of woven epoxy resin silk screen per square centimeter to obtain the epoxy resin silk screen material with singular Poisson ratio effect.
It was determined that the epoxy resin web material having the singular poisson's ratio effect produced in this example had a poisson ratio of-10.48 when the longitudinal strain was 0.0078 when it was longitudinally stretched in the y and-y directions, and 5.33 when the longitudinal strain was 0.024 when it was longitudinally compressed in the y and-y directions.
Example 8
The silk screen material with the singular poisson's ratio effect of the embodiment is formed by stacking 3 silk screen units, each silk screen unit is formed by stacking a first silk screen layer 1 and a second silk screen layer 2 which are symmetrical along an x-y plane, each first silk screen layer 1 is formed by a longitudinal silk screen which is arranged along a y direction and is bent in a wave shape and transverse silk screens which are sequentially arranged in peaks and valleys of the longitudinal silk screens, the transverse silk screens are contacted with the peaks and valleys of the longitudinal silk screens, adjacent first silk screen layers 1 are contacted with the transverse silk screens in the second silk screen layers 2, the longitudinal silk screens of the first silk screen layers 1 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent second silk screen layers 2, the longitudinal silk screens of the second silk screen layers 2 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent first silk screen layers 1, and vertical distances of the peaks and the valleys of the longitudinal silk screens in the first silk screen layers 1 in the central position of the silk screen material The vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the silk screen layers 2 are equal and are both 1.7d, the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the first silk screen layer 1 at the non-central position are equal and are both 2d with the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the second silk screen layer 2, the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the first silk screen layer 1 are equal and are both 6d with the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the second silk screen layer 2, wherein d =500 μm is the diameter of a single silk in each of the transverse silk screens and the longitudinal silk screens;
the silk screen material is prepared by the following steps:
step one, weaving epoxy resin wires with the diameter d =500 μm to obtain a woven epoxy resin wire mesh;
and step two, adopting 0.05mol/L PVA solution to the woven epoxy resin silk screen obtained in the step one, and carrying out bonding treatment on the woven epoxy resin silk screen obtained in the step one by using the amount of 0.2g of the woven epoxy resin silk screen per square centimeter to obtain the epoxy resin silk screen material with the singular Poisson ratio effect.
It was determined that the epoxy resin web material having the singular poisson's ratio effect produced in this example had a poisson ratio of-2.64 when the longitudinal strain was 0.0078 when it was longitudinally stretched in the y and-y directions, and 0.93 when the longitudinal strain was 0.024 when it was longitudinally compressed in the y and-y directions.
Example 9
The silk screen material with the singular poisson's ratio effect of the embodiment is formed by stacking 3 silk screen units, each silk screen unit is formed by stacking a first silk screen layer 1 and a second silk screen layer 2 which are symmetrical along an x-y plane, each first silk screen layer 1 is formed by a longitudinal silk screen which is arranged along a y direction and is bent in a wave shape and transverse silk screens which are sequentially arranged in peaks and valleys of the longitudinal silk screens, the transverse silk screens are contacted with the peaks and valleys of the longitudinal silk screens, adjacent first silk screen layers 1 are contacted with the transverse silk screens in the second silk screen layers 2, the longitudinal silk screens of the first silk screen layers 1 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent second silk screen layers 2, the longitudinal silk screens of the second silk screen layers 2 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent first silk screen layers 1, and vertical distances of the peaks and the valleys of the longitudinal silk screens in the first silk screen layers 1 in the central position of the silk screen material The vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the silk screen layers 2 are equal and are both 1.9d, the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the first silk screen layer 1 at the non-central position are equal and are both 2d with the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the second silk screen layer 2, the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the first silk screen layer 1 are equal and are both 4d with the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the second silk screen layer 2, wherein d =500 μm is the diameter of a single silk in each of the transverse silk screens and the longitudinal silk screens;
the silk screen material is prepared by the following steps:
step one, weaving epoxy resin wires with the diameter d =500 μm to obtain a woven epoxy resin wire mesh;
and step two, adopting 0.05mol/L PVA solution to the woven epoxy resin silk screen obtained in the step one, and carrying out bonding treatment on the woven epoxy resin silk screen obtained in the step one by using the amount of 0.1g of PVA solution per square centimeter of woven epoxy resin silk screen to obtain the epoxy resin silk screen material with singular Poisson ratio effect.
It was determined that the epoxy resin web material having the singular poisson's ratio effect prepared in this example had a poisson ratio of-8.35 when the longitudinal strain was 0.0078 when it was longitudinally stretched in the y and-y directions, and 6.85 when the longitudinal strain was 0.024 when it was longitudinally compressed in the y and-y directions.
Example 10
The silk screen material with the singular poisson's ratio effect of the embodiment is formed by stacking 3 silk screen units, each silk screen unit is formed by stacking a first silk screen layer 1 and a second silk screen layer 2 which are symmetrical along an x-y plane, each first silk screen layer 1 is formed by a longitudinal silk screen which is arranged along a y direction and is bent in a wave shape and transverse silk screens which are sequentially arranged in peaks and valleys of the longitudinal silk screens, the transverse silk screens are contacted with the peaks and valleys of the longitudinal silk screens, adjacent first silk screen layers 1 are contacted with the transverse silk screens in the second silk screen layers 2, the longitudinal silk screens of the first silk screen layers 1 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent second silk screen layers 2, the longitudinal silk screens of the second silk screen layers 2 in the central position of the silk screen material are not contacted with the longitudinal silk screens of the adjacent first silk screen layers 1, and vertical distances of the peaks and the valleys of the longitudinal silk screens in the first silk screen layers 1 in the central position of the silk screen material The vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the silk screen layers 2 are equal and are both 1.9d, the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the first silk screen layer 1 at the non-central position are equal and are both 2d with the vertical distances of the wave crests and the wave troughs of the longitudinal silk screens in the second silk screen layer 2, the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the first silk screen layer 1 are equal and are both 5d with the horizontal distances between the adjacent wave crests and the wave troughs in the longitudinal silk screens in the second silk screen layer 2, wherein d =28 μm is the diameter of a single silk in each of the transverse silk screens and the longitudinal silk screens;
the silk screen material is prepared by the following steps:
step one, weaving epoxy resin wires with the diameter d =28 μm to obtain a woven epoxy resin wire mesh;
and step two, adopting 0.05mol/L PVA solution to the woven epoxy resin silk screen obtained in the step one, and carrying out bonding treatment on the woven epoxy resin silk screen obtained in the step one by using the amount of 0.2g of the woven epoxy resin silk screen per square centimeter to obtain the epoxy resin silk screen material with the singular Poisson ratio effect.
It was determined that the epoxy resin web material having the singular poisson's ratio effect produced in this example had a poisson ratio of-0.92 when subjected to longitudinal stretching in the y and-y directions at a longitudinal strain of 0.0078 and 0.13 when subjected to longitudinal compression in the y and-y directions at a longitudinal strain of 0.024.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.

Claims (3)

1. The silk screen material with the singular Poisson ratio effect is characterized by being formed by stacking 3-26 silk screen units, each silk screen unit is formed by stacking a first silk screen layer (1) and a second silk screen layer (2) which are symmetrical along an x-y plane, the first silk screen layer (1) is formed by longitudinal silk screens which are distributed along a y direction and are bent in a wave shape and transverse silk screens which are sequentially arranged in peaks and valleys of the longitudinal silk screens in a penetrating mode, the transverse silk screens are in contact with the peaks and valleys of the longitudinal silk screens, the adjacent first silk screen layer (1) is in contact with the transverse silk screens in the second silk screen layer (2), the longitudinal silk screen of the first silk screen layer (1) in the center position of the silk screen material is not in contact with the longitudinal silk screen of the adjacent second silk screen layer (2), the longitudinal silk screen of the second silk screen layer (2) in the center position of the silk screen material is not in contact with the longitudinal silk screen of the adjacent first silk screen layer (1), the vertical distance between the wave crest and the wave trough of the longitudinal silk screen in the first silk screen layer (1) at the central position of the silk screen material is equal to the vertical distance between the wave crest and the wave trough of the longitudinal silk screen in the second silk screen layer (2) and is 1.5 d-1.9 d, the vertical distance between the wave crest and the wave trough of the longitudinal silk screen in the first silk screen layer (1) at the non-central position is equal to the vertical distance between the wave crest and the wave trough of the longitudinal silk screen in the second silk screen layer (2) and is 2d, wherein d is the diameter of a single silk in the transverse silk screen and the longitudinal silk screen;
the silk screen material is prepared by the following steps:
step one, weaving the silk to obtain a woven silk screen;
step two, heating the woven silk screen obtained in the step one to 800-1000 ℃, preserving heat for 5-20 min, and carrying out sintering treatment to obtain a silk screen material, or carrying out bonding treatment on the woven silk screen obtained in the step one by adopting 0.05mol/L PVA solution in an amount of 0.1-0.3 g of woven silk screen per square centimeter to obtain the silk screen material; the mesh material has a negative poisson's ratio when longitudinally stretched and a positive poisson's ratio when longitudinally compressed.
2. Wire mesh material with singular poisson's ratio effect according to claim 1, characterised in that the horizontal distance between adjacent peaks and troughs in a longitudinal wire in the first wire mesh layer (1) is equal to the horizontal distance between adjacent peaks and troughs in a longitudinal wire in the second wire mesh layer (2) and is 4 d-8 d each.
3. The screen material with singular poisson's ratio effect as claimed in claim 1, wherein the individual wires in the transverse and longitudinal screens are epoxy resin wires or stainless steel wires, wherein the diameter d of the individual wire is 8-1000 μm.
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