CN110947882B - Wire mesh with high negative Poisson ratio effect and preparation method thereof - Google Patents
Wire mesh with high negative Poisson ratio effect and preparation method thereof Download PDFInfo
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- CN110947882B CN110947882B CN201911252482.9A CN201911252482A CN110947882B CN 110947882 B CN110947882 B CN 110947882B CN 201911252482 A CN201911252482 A CN 201911252482A CN 110947882 B CN110947882 B CN 110947882B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F27/00—Making wire network, i.e. wire nets
- B21F27/02—Making wire network, i.e. wire nets without additional connecting elements or material at crossings, e.g. connected by knitting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F27/00—Making wire network, i.e. wire nets
- B21F27/005—Wire network per se
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
Abstract
The invention discloses a wire mesh with a high negative Poisson ratio effect, which consists of a plurality of wires arranged along the y direction and wires arranged along the x direction on an x-y plane, wherein the diameter of a single wire is d, the wires arranged along the x direction are bent with the projection length of md and the projection height of 2d in the z and-z directions in turn at intervals of a span nd, 3 wires arranged along the y direction are alternately distributed above and below the span section of the wires arranged along the x direction and are contacted with the wires arranged along the x direction, and the distance between two adjacent wires in the group of wires arranged along the y direction is (nd-3 d)/2. In addition, the invention also provides a preparation method of the metal wire mesh with the high negative Poisson ratio effect, the Poisson ratio of the prepared metal wire mesh with the high negative Poisson ratio effect is not more than-37, is more than twice of that of the prior art, and can be applied to occasions requiring large strain ratio.
Description
Technical Field
The invention belongs to the technical field of production of wire mesh, and particularly relates to a wire mesh with a high negative Poisson ratio effect and a preparation method thereof.
Background
The metal wire mesh is a porous material with adjustable Poisson ratio, and can generate negative Poisson ratio effect, so that the metal wire mesh can generate obvious transverse extension or contraction when longitudinally extending or contracting, and the Poisson ratio of the metal wire mesh is<0, the characteristic has the effect of converting longitudinal strain into transverse strain, so that the strain sensor has a larger application value in the field of strain sensors, and the Poisson ratio is expressed as follows: v ═ one-z/xWherein v is the Poisson's ratio,zis a transverse strain in the thickness direction in the elastic phase,xis longitudinal in the in-plane direction of the elastic phaseTowards strain, the larger the absolute value of poisson's ratio, the higher the strain conversion efficiency, and therefore wire mesh with a high negative poisson's ratio effect is urgently needed.
The conventional wire mesh has a certain initial tortuosity, and is obtained by weaving a structure and compressing in the thickness direction, but the negative poisson's ratio effect is not existed or is not obvious, so the control of the arrangement sequence of the bent wires in the wire mesh, especially the span of the bent wires, is important for obtaining the wire mesh with the high negative poisson's ratio effect, for example, Chinese patent No. CN101799229B, which describes a structure of the wire mesh, and is characterized in that warp wires and weft wires are woven alternately, Chinese patent No. CN104289717A describes a pre-compression sintering method of Cu fiber felt, fibers are put into a mould and are pre-compressed to a set porosity by hand, and then are sintered in vacuum, so as to obtain the sintered metal fiber felt, the wire mesh prepared by the process described in the patents cannot obtain the high negative poisson's ratio effect through special structural design, and the poisson's ratio is generally larger than-1, the poisson ratio of the material with the strongest negative poisson ratio effect found in practice at present is-18.
Disclosure of Invention
The present invention is directed to a wire mesh with a high negative poisson's ratio, which overcomes the above-mentioned shortcomings of the prior art. By controlling the span, the projection length and the projection height, the Poisson ratio of the prepared metal wire mesh with the high negative Poisson ratio effect is not more than-37, is more than twice of the negative Poisson ratio generated in the prior art, and can be applied to occasions requiring large strain ratios, such as a strain amplifier and the like.
In order to solve the technical problems, the invention adopts the technical scheme that: the wire mesh with the high negative Poisson ratio effect is characterized by comprising a plurality of wires arranged along the y direction and wires arranged along the x direction on an x-y plane, wherein the diameter of a single wire is d, each wire arranged along the x direction on the x-y plane is bent towards the z direction and the-z direction in turn at intervals of a span nd, the projection length is md, the projection height is 2d, and 3 wires arranged along the y direction are alternately distributed in a groupThe distance between two adjacent metal wires in a group of 3 metal wires arranged along the y direction is (nd-3d)/2, and n and m satisfy the following conditions that the metal wires arranged along the x direction are above the span section and below the span section and are in contact with the metal wires arranged along the x direction
And n is more than or equal to 3, m is more than or equal to 1, and the metal wire mesh has a Poisson ratio of not more than-37 when stretched in the longitudinal direction.
The wire mesh with the high negative poisson's ratio effect is characterized in that the number of the wires arranged along the x direction in the x-y plane is not less than 1, and the number of the span sections is not less than 3. The number of the metal wires distributed along the x direction on the x-y plane is not less than 1, the number of the span sections is not less than 3, and the longitudinal displacement and the longitudinal strain of the metal wire mesh are controlled when the metal wire mesh is longitudinally stretched, so that the negative Poisson ratio effect is promoted, and the prepared metal wire mesh is ensured to generate the high negative Poisson ratio effect when the metal wire mesh is longitudinally stretched.
In addition, the invention also provides a preparation method of the metal wire mesh with the high negative Poisson ratio effect, which is characterized by comprising the following steps:
step one, weaving a metal wire to obtain a woven metal wire mesh;
and step two, carrying out vacuum high-temperature sintering treatment on the woven wire mesh obtained in the step one to obtain the wire mesh with the high negative Poisson ratio effect.
In the above method, in the first step, the diameter d of the wire is 2 μm to 1000 μm, and the wire is made of an iron alloy, an aluminum alloy, a titanium alloy, or a copper alloy. The diameter d of the metal wire is 2-1000 microns, so that the obtained metal wire mesh with the high negative Poisson ratio effect has proper transverse deformation when being longitudinally stretched, and the defects of small transverse deformation, low tensile strength and the like caused by too large or too small diameter are avoided.
The method is characterized in that the vacuum high-temperature sintering process in the step two is as follows: heating to 600-1300 ℃ under the condition that the vacuum degree is not more than 0.01Pa, and then preserving heat for 10-60 min. The invention adopts the vacuum high-temperature sintering treatment of heating to 600-1300 ℃ and then preserving the heat for 10-60 min under the condition that the vacuum degree is not more than 0.01Pa, so that the contact points among the metal wires of the metal wire mesh are metallurgically bonded, the bonding among the metal wires is realized, the metal wires distributed along the x direction and the metal wires distributed along the y direction are ensured to form a whole, and the prepared metal wire mesh is ensured to have high negative Poisson ratio effect when being longitudinally stretched.
The wire mesh of the present invention has the principle of high negative poisson's ratio effect: the high negative poisson's ratio effect of the wire mesh with high negative poisson's ratio effect produced by the invention is mainly produced by the wires arranged along the x direction in the x-y plane, the size of the high negative poisson's ratio is mainly determined by the size of the span nd and the curved projection length md, the longitudinal displacement of the wire mesh with high negative poisson's ratio effect produced by the invention is determined by the curved projection length md according to the geometrical relation, the larger the curved projection length md, the smaller the longitudinal displacement, and the longitudinal strain is determined by the size of the curved projection length md and the span nd because the longitudinal strain is equal to the longitudinal initial length removed in the longitudinal direction, therefore, in order to reduce the longitudinal strain and promote the high negative poisson's ratio effect, the curved projection length md and the span nd should be increased as much as possible, wherein the curved projection length md and the span nd need to satisfy a certain relative relation, the Poisson ratio of the metal wire mesh with the high negative Poisson ratio effect prepared by the invention is less than-37, and m and n can meet the requirements
The invention is to make the obtained value of the negative Poisson ratio sufficiently large, and can be applied to the occasions requiring large strain ratio, such as a strain amplifier, and the like, and the span is required to be madend is sufficiently large, but if the span nd is too large, the final longitudinal strain will be very small, and when the longitudinal strain is less than 0.001, the measurement range of a general strain gauge is exceeded, and is not practical for most applications, so m and n should satisfy
In combination, m and n should satisfy:
after the wire mesh with the high negative Poisson ratio effect is longitudinally stretched in the x direction and the-x direction, the bent wires arranged in the x direction in the wire mesh are straightened, and the wires arranged in the y direction and in contact with the span section are pushed out in the z direction and the-z direction, so that the wire mesh with the high negative Poisson ratio effect expands in the z direction and the-z direction, and the whole wire mesh with the high negative Poisson ratio effect generates large transverse expansion in the z direction and the-z direction, and generates the remarkable negative Poisson ratio effect.
Compared with the prior art, the invention has the following advantages:
1. according to the metal wire mesh with the high negative Poisson ratio effect, the metal wires distributed along the x direction are sequentially subjected to bending with the projection length md and the projection height 2d in the z direction and the-z direction every other span nd, and the longitudinal displacement and the longitudinal strain of the metal wire mesh with the high negative Poisson ratio effect are controlled by adjusting the span nd and the bending projection length md, so that the whole metal wire mesh with the high negative Poisson ratio effect is subjected to large transverse expansion, the negative Poisson ratio effect of the metal wire mesh with the high negative Poisson ratio effect is promoted, the preparation of the metal wire mesh with the high negative Poisson ratio effect is realized, and a novel method is provided for manufacturing the metal wire mesh with the high negative Poisson ratio effect.
2. The metal wire mesh with the high negative Poisson ratio effect prepared by the invention has the negative Poisson ratio which is not more than-37 during longitudinal stretching, is more than twice of the negative Poisson ratio generated by the material prepared by the prior art, is far higher than the negative Poisson ratio of the prior material, solves the defect that the negative Poisson ratio effect of the prior metal wire mesh structure is too small, can be applied to occasions requiring large strain ratio, such as a strain amplifier, and has great application prospect.
3. According to the invention, the contact points between the metal wires of the metal wire mesh are subjected to the vacuum high-temperature sintering treatment, the metal wires are subjected to the metallurgical bonding, and the generated metallurgical bonding ensures that the metal wires distributed along the x direction and the metal wires distributed along the y direction form a whole, so that the preparation of the metal wire mesh with the high negative Poisson ratio effect is realized, and the prepared metal wire mesh with the high negative Poisson ratio effect has stable performance.
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 top view of a wire mesh made in accordance with the present invention having a high negative poisson's ratio effect.
Fig. 2 is a front view of a wire-mesh with a high negative poisson's ratio effect produced by the present invention.
FIG. 3 is a front view of a 316L stainless steel wire mesh with high negative Poisson's ratio effect prepared in example 1 of the present invention.
FIG. 4 is a front view of a 316L stainless steel wire mesh with high negative Poisson's ratio effect prepared in example 1 of the present invention after longitudinal stretching.
Detailed Description
As shown in fig. 1 and 2, the wire mesh with high negative poisson's ratio effect prepared by the present invention is composed of a plurality of wires arranged along the y direction and wires arranged along the x direction on the x-y plane, wherein the diameter of a single wire is d, each wire arranged along the x direction on the x-y plane is bent in the z direction and the-z direction in turn at intervals of a span nd, the projected length is md, and the projected height is 2d, 3 wires arranged along the y direction are alternately distributed above and below the span section of the wires arranged along the x direction and are in contact with each other, and the distance between two adjacent wires in the group of 3 wires arranged along the y direction is (nd-3 d)/2.
Example 1
The wire mesh with the high negative poisson's ratio effect in the embodiment is composed of 9 wires arranged along the y direction and 3 wires arranged along the x direction on an x-y plane, wherein the diameter of a single wire is 28 μm, each wire arranged along the x direction on the x-y plane is bent in the z direction and the-z direction sequentially every 9d, the projection length is 3d, and the projection height is 2d, the wires arranged along the y direction are distributed above and below the span section of the wires arranged along the x direction alternately in a group of 3 wires, and are in contact with the wires arranged along the x direction, and the distance between two adjacent wires in the group of 3 wires arranged along the y direction is 3 d.
The preparation method of the wire mesh with the high negative poisson's ratio effect in the embodiment comprises the following steps:
step one, weaving 316L stainless steel wires with the diameter d of 28 mu m to obtain woven 316L stainless steel wire nets;
and step two, heating the woven 316L stainless steel wire mesh obtained in the step one to 1200 ℃ under the condition that the vacuum degree is 0.01Pa, and then preserving the heat for 60min to obtain the 316L stainless steel wire mesh with the high negative Poisson ratio effect.
Through detection, when the 316L stainless steel wire mesh with the high negative Poisson ratio effect is longitudinally stretched in the x and-x directions, the Poisson ratio is-37 when the longitudinal strain is 0.0135.
Fig. 3 is a front view of the 316L stainless steel wire mesh with high negative poisson's ratio effect prepared in this example, and as can be seen from fig. 3, when the 316L stainless steel wires are arranged in the x-y plane along the x direction, bends with a projection length of 3d and a projection height of 2d occur in the z direction and the-z direction in sequence every 9d, the 316L stainless steel wires are arranged in the y direction, 3 316L stainless steel wires are distributed in groups above the span section and below the span section of the 316L stainless steel wires arranged in the x direction and are in contact with the 316L stainless steel wires arranged in the x direction, the contact points are metallurgically bonded, the distance between adjacent 316L stainless steel wires in one group is 3d, the horizontal distance h between 316L stainless steel wires located in the middle position of each group in two groups separated by one group is 24d, when the 316L stainless steel wire mesh is longitudinally stretched, the bending tends to rotate laterally.
Fig. 4 is a front view of the 316L stainless steel wire mesh with high negative poisson ratio effect prepared in this embodiment after being longitudinally stretched, and as can be seen from fig. 4, after the 316L stainless steel wire mesh is longitudinally stretched in the x and-x directions, the bend of the 316L stainless steel wire is straightened, the 316L stainless steel wire in contact with the span section is pushed out in the z and-z directions, so that the 316L stainless steel wire mesh is expanded in the z and-z directions, which results in large transverse expansion of the 316L stainless steel wire mesh in the z and-z directions, and a significant negative poisson ratio effect is generated, after being stretched, the horizontal distance between the 316L stainless steel wires in the middle of two groups separated by one group becomes h 24.3d, and the thickness of the 316L stainless steel wire mesh becomes 3 d.
Comparative example 1
The wire mesh with the high negative Poisson ratio effect of the comparative example consists of 9 wires arranged along the y direction and 3 wires arranged along the x direction on an x-y plane, wherein the diameter of a single wire is 28 microns, each wire arranged along the x direction on the x-y plane is bent in the z direction and the-z direction in sequence every 5d of a span, the projection length is 3d, the projection height is 2d, the 3 wires arranged along the y direction are alternately distributed above and below a span section of the wires arranged along the x direction and are in contact with the wires arranged along the x direction, and the distance between two adjacent wires in the 3 wires arranged along the y direction is d.
The preparation method of the metal wire mesh with the high negative Poisson ratio effect of the comparative example comprises the following steps:
step one, weaving 316L stainless steel wires with the diameter d of 28 mu m to obtain woven 316L stainless steel wire nets;
and step two, heating the woven 316L stainless steel wire mesh obtained in the step one to 1200 ℃ under the condition that the vacuum degree is 0.01Pa, and then preserving the heat for 60min to obtain the 316L stainless steel wire mesh with the high negative Poisson ratio effect.
The 316L stainless steel wire mesh prepared by the comparison is detected to have a Poisson ratio of-27 when the longitudinal strain is 0.0188 when the stainless steel wire mesh is longitudinally stretched along the x direction and the-x direction.
As can be seen by comparing this comparative example with example 1, n and m do not satisfy this comparative example
The negative poisson's ratio of the prepared 316L stainless steel wire mesh is smaller than that of example 1, and the requirement of high negative poisson's ratio effect cannot be met.
Comparative example 2
The wire mesh with the high negative Poisson ratio effect of the comparative example consists of 9 wires arranged along the y direction and 3 wires arranged along the x direction on an x-y plane, wherein the diameter of a single wire is 28 microns, each wire arranged along the x direction on the x-y plane is bent in sequence towards the z direction and the-z direction at intervals of 157d, the projection length is 3d, the projection height is 2d, the wires arranged along the y direction are distributed on a span section and under the span section of the wires arranged along the x direction in a group of 3 wires in an alternating mode, the wires are in contact with the wires arranged along the x direction, and the distance between two adjacent wires in the group of 3 wires arranged along the y direction is 77 d.
The preparation method of the metal wire mesh with the high negative Poisson ratio effect of the comparative example comprises the following steps:
step one, weaving 316L stainless steel wires with the diameter d of 28 mu m to obtain woven 316L stainless steel wire nets;
and step two, heating the woven 316L stainless steel wire mesh obtained in the step one to 1200 ℃ under the condition that the vacuum degree is 0.01Pa, and then preserving the heat for 60min to obtain the 316L stainless steel wire mesh with the high negative Poisson ratio effect.
It was found that the 316L stainless steel wire mesh prepared by this comparison, when longitudinally stretched in the x and-x directions, had a longitudinal strain of only 0.00094 when the longitudinal wires were straightened, and did not produce a negative poisson's ratio effect.
As can be seen by comparing this comparative example with example 1, n and m do not satisfy this comparative example
The requirement of (3) is that the prepared 316L stainless steel wire mesh does not generate a negative Poisson ratio effect and cannot meet the requirement of high negative Poisson ratio effect.
As can be seen by comparing comparative examples 1 and 2 with example 1, when n and m do not satisfy
The prepared 316L stainless steel wire mesh cannot generate a remarkable negative Poisson ratio effect.
Comparative example 3
The wire mesh with the high negative Poisson ratio effect of the comparative example consists of 9 wires arranged along the y direction and 3 wires arranged along the x direction on an x-y plane, wherein the diameter of a single wire is 28 microns, each wire arranged along the x direction on the x-y plane is bent in the z direction and the-z direction in turn at intervals of 9d, the projection length is 3d, the projection height is 2d, the wires arranged along the y direction are distributed on a span section and below the span section of the wires arranged along the x direction in a group of 3 wires alternately, the wires are in contact with the wires arranged along the x direction, and the distance between two adjacent wires in the group of 3 wires arranged along the y direction is 3 d.
The preparation method of the metal wire mesh with the high negative Poisson ratio effect of the comparative example comprises the following steps:
step one, weaving 316L stainless steel wires with the diameter d of 28 mu m to obtain woven 316L stainless steel wire nets;
and step two, heating the woven 316L stainless steel wire mesh obtained in the step one to 1350 ℃ under the condition that the vacuum degree is 0.01Pa, and then preserving the heat for 60min to obtain the 316L stainless steel wire mesh with the high negative Poisson ratio effect.
The 316L stainless steel wire mesh prepared by the comparison is detected to have a Poisson ratio of-10 when the longitudinal strain is 0.0125 when the stainless steel wire mesh is longitudinally stretched along the x direction and the-x direction.
As can be seen by comparing the comparative example with the example 1, the temperature of the high-temperature sintering treatment in the comparative example exceeds the range of 600-1300 ℃, the requirement of the bonding strength between the metal wires is not met, the value of the negative Poisson ratio of the prepared 316L stainless steel wire mesh is smaller than that of the example 1, and the requirement of high negative Poisson ratio effect cannot be met.
Example 2
The wire mesh with the high negative poisson's ratio effect in the embodiment is composed of 9 wires arranged along the y direction and 3 wires arranged along the x direction on the x-y plane, wherein the diameter of a single wire is 2 μm, each wire arranged along the x direction on the x-y plane is bent in the z direction and the-z direction in sequence every 9d, the projection length is 3d, and the projection height is 2d, the wires arranged along the y direction are distributed above and below the span section of the wires arranged along the x direction alternately in groups of 3 wires, and are in contact with the wires arranged along the x direction, and the distance between two adjacent wires in the group of 3 wires arranged along the y direction is 3 d.
The preparation method of the wire mesh with the high negative poisson's ratio effect in the embodiment comprises the following steps:
step one, weaving red copper wires with the diameter d of 2 mu m to obtain woven red copper wire meshes;
and step two, heating the woven red copper wire mesh obtained in the step one to 1000 ℃ under the condition that the vacuum degree is 0.01Pa, and then preserving the heat for 50min to obtain the red copper wire mesh with the high negative Poisson ratio effect.
Through detection, when the red copper wire mesh with the high negative Poisson ratio effect is longitudinally stretched in the x and-x directions, the Poisson ratio is-37 when the longitudinal strain is 0.0135.
Example 3
The wire mesh with the high negative poisson's ratio effect in the embodiment is composed of wires arranged in the x direction on an x-y plane and wires arranged in the y direction, wherein the diameter of each wire is 1000 μm, the wires arranged in the x direction are bent in the z direction and the-z direction in sequence every 21d, the projection length of each wire is 3d, the projection height of each wire is 2d, the wires arranged in the y direction are distributed above and below the span section of the wires arranged in the x direction in a group of 3 wires and are in contact with the wires arranged in the x direction, and the distance between the adjacent wires in the group is 9 d.
The preparation method of the wire mesh with the high negative poisson's ratio effect in the embodiment comprises the following steps:
step one, weaving red copper wires with the diameter d of 1000 mu m to obtain woven red copper wire meshes;
and step two, heating the woven red copper wire mesh obtained in the step one to 1000 ℃ under the condition that the vacuum degree is 0.01Pa, and then preserving the heat for 60min to obtain the red copper wire mesh with the high negative Poisson ratio effect.
Through detection, the red copper wire mesh with the high negative Poisson ratio effect prepared by the method is stretched longitudinally along the x and-x directions, and when the longitudinal strain is 0.006, the Poisson ratio is-80.
Example 4
The wire mesh with the high negative poisson's ratio effect in the embodiment is composed of 9 wires arranged along the y direction and 3 wires arranged along the x direction on the x-y plane, wherein the diameter of a single wire is 1000 μm, each wire arranged along the x direction on the x-y plane is bent in the z direction and the-z direction in sequence every 78d, the projection length of each wire is 3d, and the projection height of each wire is 2d, the wires arranged along the y direction are distributed above and below the span section of the wires arranged along the x direction alternately in groups of 3 wires, the wires are in contact with each other in the x direction, and the distance between two adjacent wires in the group of 3 wires arranged along the y direction is 37.5 d.
The preparation method of the wire mesh with the high negative poisson's ratio effect in the embodiment comprises the following steps:
step one, carrying out weaving treatment on a Ti6Al4V wire with the diameter d of 1000 mu m to obtain a woven Ti6Al4V wire mesh;
and step two, heating the woven Ti6Al4V silk screen obtained in the step one to 1300 ℃ under the condition that the vacuum degree is 0.01Pa, and then preserving the heat for 10min to obtain the Ti6Al4V silk screen with the high negative Poisson ratio effect.
The Ti6Al4V silk screen with high negative Poisson ratio effect prepared by the method is detected to have a Poisson ratio of-493 when the longitudinal strain is 0.0013 when the screen is longitudinally stretched in the x and-x directions.
Example 5
The wire mesh with the high negative poisson's ratio effect in the embodiment is composed of 9 wires arranged along the y direction and 3 wires arranged along the x direction on the x-y plane, wherein the diameter of a single wire is 1000 μm, each wire arranged along the x direction on the x-y plane is bent sequentially along the z direction and the-z direction at intervals of 50d, the projection length is 3d, and the projection height is 2d, the wires arranged along the y direction are alternately distributed above and below the span section of the wires arranged along the x direction by taking 3 wires as a group, and are in contact with the wires arranged along the x direction, and the distance between two adjacent wires in the wires arranged along the y direction by taking 3 wires as a group is 23.5 d.
The preparation method of the wire mesh with the high negative poisson's ratio effect in the embodiment comprises the following steps:
step one, weaving an aluminum wire with the diameter d of 1000 mu m to obtain a woven aluminum wire mesh;
and step two, heating the woven aluminum wire mesh obtained in the step one to 600 ℃ under the condition that the vacuum degree is 0.01Pa, and then preserving the heat for 60min to obtain the aluminum wire mesh with the high negative Poisson ratio effect.
It was determined that the aluminum mesh with high negative poisson's ratio effect produced by this example had a poisson ratio of-133 when the longitudinal strain was 0.0038 when stretched longitudinally in the x and-x directions.
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 (5)
1. A wire mesh with high negative Poisson's ratio effect is characterized in that the wire mesh is composed of a plurality of wires arranged along the y direction and a plurality of wires arranged along the x direction on the x-y plane, wherein the diameter of a single wire is d, and each wire arranged along the x direction on the x-y plane is usedBending with the projection length of md and the projection height of 2d is sequentially generated towards the z direction and the-z direction at intervals of the span nd, the metal wires distributed along the y direction are alternately distributed above and below the span section of the metal wires distributed along the x direction by taking 3 metal wires as a group and are contacted with the metal wires distributed along the x direction, the distance between two adjacent metal wires in the metal wires distributed along the y direction by taking 3 metal wires as a group is (nd-3d)/2, and n and m meet the requirement that the projection length is md and the projection height is 2d
And n is more than or equal to 3, m is more than or equal to l, and the metal wire mesh has a Poisson ratio of not more than-37 when stretched longitudinally.
2. The wire-net with high negative poisson's ratio effect according to claim 1, wherein the number of wires arranged in x-y plane along x-direction is not less than 3, and the number of span segments is not less than 3.
3. A method for preparing a wire-net with a high negative poisson's ratio effect as claimed in claim 1 or 2, characterized in that it comprises the steps of:
step one, weaving a metal wire to obtain a woven metal wire mesh;
and step two, carrying out vacuum high-temperature sintering treatment on the woven wire mesh obtained in the step one to obtain the wire mesh with the high negative Poisson ratio effect.
4. The method according to claim 3, wherein in the first step, the diameter d of the metal wire is 2 μm to 1000 μm, and the metal wire is made of iron alloy, aluminum alloy, titanium alloy or copper alloy.
5. The method according to claim 3, wherein the vacuum high-temperature sintering process in the second step is as follows: heating to 600-1300 ℃ under the condition that the vacuum degree is not more than 0.01Pa, and then preserving heat for 10-60 min.
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