CN210461501U - Three-dimensional chiral pressure-torsion structure and sandwich structure - Google Patents
Three-dimensional chiral pressure-torsion structure and sandwich structure Download PDFInfo
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- CN210461501U CN210461501U CN201921379094.2U CN201921379094U CN210461501U CN 210461501 U CN210461501 U CN 210461501U CN 201921379094 U CN201921379094 U CN 201921379094U CN 210461501 U CN210461501 U CN 210461501U
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Abstract
The utility model discloses a structure and sandwich structure are turned round to three-dimensional chirality pressure, three-dimensional chirality pressure is turned round the structure and is arranged on three-dimensional direction by a plurality of units and connect and constitute, the unit is the regular hexahedron form, every of unit includes: the disc-shaped connector comprises four first connecting rods with the same length, four discs with the same size and four second connecting rods with the same length, wherein the circle centers of the discs are respectively positioned at four corners of a square, the first connecting rods are connected between every two adjacent discs, each disc is connected with one second connecting rod, the first connecting rods are tangent to the two connected discs and are opposite to each other, the first connecting rods are parallel to each other, the second connecting rods are tangent to the connected discs, and one ends of the second connecting rods are positioned at the four corners of the surface. The three-dimensional chiral pressure twist structure can be twisted when stressed, and has a good energy absorption effect.
Description
Technical Field
The utility model belongs to the technical field of damping energy-absorbing material, concretely relates to structure and sandwich structure are turned round to three-dimensional chirality pressure.
Background
With the development of modern industry, many devices and equipment need to use vibration dampers to reduce low frequency vibration. The existing shock absorber is usually a spring, but the spring can only absorb energy axially, and is not suitable for a scene needing to bear vibration in multiple directions.
When a common linear rod is pulled and pressed, the material is deformed in all directions, and the modal transformation and the advanced mechanical design of the material are limited. And reasonable structural design can enable the material to have unusual mechanical properties. For example, the chirality refers to the property that an object does not overlap with a mirror image of the object, the torsion structure refers to a structure in which a material can be twisted when tension or pressure is applied, the three-dimensional chiral torsion structure can break through the limitation that the material can be deformed in all directions when the material is pressed, and the material can be twisted when the material is pressed, so that the three-dimensional chiral torsion structure can be widely applied to buffering, shock absorption, impact resistance, energy absorption and the like.
The patent document with the application number of 201810264791.7 discloses a vibration absorber based on a tension-torsion coupling metamaterial structure, which comprises a left connecting piece, a main body and a right connecting piece, wherein the main body part adopts a special chiral metamaterial structure, and when the connecting pieces are under the action of tension or pressure, the main body can generate torsional displacement and deformation so as to absorb a part of energy, so that the purpose of vibration reduction is achieved. The metamaterial adopted by the main body is a hollow circular tube structure formed by winding a hexagonal net-shaped unit as a base and a net-shaped material at a certain angle, and the structure is similar to a microscopic single-wall chiral carbon nanotube structure and is different from the structure of the application.
Disclosure of Invention
The utility model aims at providing a three-dimensional chirality is pressed and is turned round structure and sandwich structure, aim at solving the current problem that damping structure damping performance is not enough.
In order to achieve the above object, the present invention provides a three-dimensional chiral twist structure, which is formed by arranging and connecting a plurality of units in a three-dimensional direction, wherein the units are in a regular hexahedron shape, and each face of the units comprises: four the same length's first connecting rod, four the same size's disc and four the same length's second connecting rod, four the centre of a circle of disc is located the four corners position of a square respectively, first connecting rod is connected in adjacent two between the disc, each one is connected to the disc the second connecting rod, four the deviating from of second connecting rod the one end of disc is located respectively the four corners position of face, first connecting rod is tangent with two discs that link to each other, and relative two first connecting rod is parallel to each other, the second connecting rod is tangent with the disc that links to each other, every the face is seen from the extroversion, the second connecting rod winds the central axis of face leans out according to the first direction and extends, the first direction is clockwise or anticlockwise, every the first direction is unanimous.
Preferably, four first links on one of said faces: are both located at the internal common tangent of the two disks to which they are attached.
Preferably, four first links on one of said faces: are located at the outer common tangent of the two discs to which they are attached.
Preferably, four first links on one of said faces: one pair of the opposite first connecting rods is positioned at the position of the internal common tangent of the two connected disks, and the other pair of the opposite second connecting rods is positioned at the position of the external common tangent of the two connected disks.
Preferably, when a plurality of the cells are connected in a three-dimensional arrangement, a sphere is formed at the vertex position of each connected cell.
Preferably, the cross section of the first connecting rod and the cross section of the second connecting rod are rectangular or circular.
Preferably, the first link and the second link are linear, curved or spring-shaped.
Preferably, a line connecting the centers of the two disks at the diagonal positions is located on the central symmetry line of the unit.
Preferably, the three-dimensional chiral crimp structure is formed by 3D printing of multiple materials.
The utility model also provides a sandwich structure, include: the sandwich structure comprises a first plane structure, a second plane structure and a sandwich core positioned between the first plane structure and the second plane structure, wherein the sandwich core adopts any one of the three-dimensional chiral pressure-torsion structures.
Compared with the prior art, the utility model discloses technical scheme's beneficial effect:
the utility model discloses three-dimensional chirality is pressed and is turned round structure and is piled up the extension by a plurality of units along the three-dimensional direction of square and form, can show the rotatory characteristic of atress, and the unit is when receiving positive pressure promptly, goes up plane and bottom surface and can take place to twist reverse relatively, and this kind of characteristic makes this three-dimensional chirality twist reverse the structure and can be applied to and convert the energy wave, plays good energy-absorbing effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a structural diagram of a three-dimensional chiral pressure-torsion structure according to an embodiment of the present invention;
FIG. 2 is a block diagram of a single unit in the three-dimensional chiral crimp structure set forth in FIG. 1;
FIG. 3 is an exploded view of FIG. 2;
FIG. 4 is a block diagram of each of the facets of FIG. 2;
FIG. 5 is a geometric diagram of FIG. 4;
FIG. 6 is a schematic diagram illustrating the torsion variation of a prior art compression structure unit under a force;
FIG. 7 is a schematic diagram of the torsion change of the three-dimensional chiral piezostricture unit proposed in FIG. 1 under a force;
FIG. 8 is a schematic diagram of the overall torsional deformation of a plurality of three-dimensional chiral compression and torsion structure units when the units are vertically overlapped and then pressed;
FIG. 9a is a schematic diagram of the three-dimensional chiral crimp structure of the single unit of FIG. 1 prior to compression;
FIG. 9b is a schematic diagram of the three-dimensional chiral crimp structure of the single unit of FIG. 1 after compression;
FIG. 10 is a graph comparing the relationship between the energy absorption rate and the strain test piece of the three-dimensional chiral pressure-torsion structure and the conventional pressure-torsion structure in FIG. 1 at a certain impact speed;
fig. 11 is a schematic structural view of each face of the three-dimensional chiral crimp structure unit according to the second embodiment of the present invention;
fig. 12 is a schematic structural view of each face of the three-dimensional chiral crimp knot structure unit according to the third embodiment of the present invention;
fig. 13 is a schematic structural diagram of a sandwich structure according to a third embodiment of the present invention.
The reference numbers of the utility model explain:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 1、1’、1” | First connecting |
4 | |
| 2、2’、2” | Disc with a |
5 | |
| 3 | Second connecting |
6 | Sandwich |
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; the connection can be mechanical connection or point connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
Example one
Referring to fig. 1 to 9, in the first embodiment, a three-dimensional chiral kink structure is provided, which includes a plurality of units, each unit has a regular hexahedral structure, each surface of the unit is provided with four first connecting rods 1 having the same length, four disks 2 having the same size, and four second connecting rods 3 having the same length, wherein the four disks 2 are connected to each other through the four first connecting rods 1, the centers of the four disks 2 are located at four corners of a square, the first connecting rods 1 are tangent to the two corresponding disks 2, the four second connecting rods 3 are tangent to the four disks 2, the second connecting rods 3 are located at internal common tangent positions of two adjacent disks 2, the outer ends of the second connecting rods 3 are located at four corners of a surface of the unit, each surface is viewed from outside to inside, the second connecting rods 3 extend obliquely in a first direction around the central axis of the surface, the first direction is clockwise or anticlockwise, and the first direction of each face is unanimous, and relative upper and lower two faces are about not just right promptly, also are mirror symmetry.
Specifically, referring to fig. 5 again, fig. 5 shows a two-dimensional chiral structure of each surface of a single unit, where O1, O2, O3, and O4 respectively represent centers of circles of four disks 2, points a1, a2, A3, and a4 respectively represent ends of four second links 3, and the four second links 3 and the four disks 2 are tangent to points a5, A6, a7, and A8 respectively. The connection of O1, O2, O3 and O4 can form a square, the side length is W, four points A1, A2, A3 and A4 can form a square, L1 is L2, and the first connecting rod 1 is positioned on the internal common tangent of two adjacent disks 2.
Six identical two-dimensional chiral structures are used as six faces of a cube to be connected and combined, and the second connecting rods 3 of two adjacent faces are connected with each other, so that a unit of the three-dimensional chiral torsion structure can be obtained. Pile up the extension with a plurality of units along the three-dimensional direction of square, the second connecting rod 3 interconnect of two adjacent units can show the rotatory characteristic of atress: when the unit is under positive pressure, the unit is short but does not expand around as a conventional material, but the upper plane and the bottom surface are twisted relatively, so that the three-dimensional chiral twisted structure can be applied to converting energy waves and has a good energy absorption effect.
Fig. 9a is a structural view of the single unit of the three-dimensional chiral pressure-kink structure proposed in fig. 1 before being pressed, fig. 9b is a structural view of the single unit of the three-dimensional chiral pressure-kink structure proposed in fig. 1 after being pressed, and fig. 9a and 9b are compared with each other, and the upper plane and the bottom plane are slightly twisted.
As shown in fig. 6 and 7, in the prior art, the structural unit of the press-and-twist material is generally formed by extending a tangent line around a great circle to form a surface, and then a hexahedral unit is formed by the six surfaces. In the embodiment, the inner sides of the four disks 2 are further connected with each other through the first connecting rod 1, and the first connecting rod 1 is tangent to the corresponding disk 2, so that when a plurality of units are stacked together to process an integral new material, under the action of positive pressure in the vertical direction, the third connecting rod 3 can be twisted relative to each disk 2, and each disk 2 can also be twisted relative to the first connecting rod 1, so that a better energy absorption effect is achieved.
Will the utility model provides a press knot to construct the unit, establish finite element model in ABAQUS software, the size of giving this structure test piece is: L1-L2-w-1.5 mm, the cross section of the connecting rod is a square with side length of 0.15 mm. In order to ensure the reliability of simulation, the length, the height and the width of the traditional compression structure unit are also 4mm, the cross section of the connecting rod is also a square with the side length of 0.15mm, and the inner diameter of the connecting rod is 1.5 mm. To avoid shear auto-locking in the simulation, the mesh is divided in tetrahedral units.
In order to verify that the energy absorption effect of the chiral compression and torsion structure unit provided by the embodiment is better than that of the traditional compression and torsion structure unit, in order to provide an accurate result as much as possible, the finite element simulation structure of the compression and torsion structure unit and the traditional compression and torsion structure unit emphasizes that the same material is adopted, the compression and torsion structure unit is extruded at the same speed, through simulation, a comparison graph of the relation curve of the energy absorption rate and the strain test piece at a certain impact speed by adopting the three-dimensional chiral compression and torsion structure and the traditional compression and torsion structure is given in fig. 10, and the result proves that: the energy absorption effect of the compression-torsion structural unit given by the example under the conditions of the same size, the same material property and the same boundary condition is obviously superior to that of the traditional compression-torsion structural unit.
Further, the first link 1 and the second link 3 are linear or curved.
Further, the girth of the first link 1 and the second link 3 is varied or constant along the extending direction thereof.
Further, the first link 1 and the second link 3 have a rectangular or circular cross section.
Furthermore, the three-dimensional chiral pressure-kinking structure is formed by 3D printing of multiple materials.
Further, when a plurality of the units are connected in a three-dimensional arrangement, the vertex positions of the connected units form a sphere, that is, the vertex position of each unit is provided with an eighth sphere.
Example two
Referring to fig. 11, the second embodiment proposes another three-dimensional chiral piezoelectric structure. The second embodiment is different from the first embodiment in that:
four disks 2 ' are arranged at the four corners of a square, a first connecting rod 1 ' is connected with the two disks 2 ', and the first connecting rod 1 ' is arranged at the position of an external common tangent of the two adjacent disks 2 '.
EXAMPLE III
Referring to fig. 12, the second embodiment proposes another three-dimensional chiral piezoelectric structure. The second embodiment is different from the first embodiment in that:
the four disks 2 ' are arranged at four corners of a square, every two adjacent disks 2 ' are connected through a first connecting rod 1 ', one pair of first connecting rods 1 ' is arranged at the position of the outer common tangent of the two adjacent disks 2 ', and the other pair of first connecting rods 1 ' is arranged at the position of the inner common tangent of the two adjacent disks 2 '.
Example four
Referring to fig. 13, a fourth embodiment of the present invention provides a sandwich structure, including: the structure comprises a first planar structure 4, a second planar structure 5 and a sandwich 6 positioned between the first planar structure 4 and the second planar structure 5, wherein the sandwich 6 adopts the three-dimensional chiral pressure-torsion structure in any one of the embodiments.
The first planar structure 4 and the second planar structure 5 are thin plate structures having a certain transverse length and a certain longitudinal length, and may be made of materials such as polyurethane elastomer, silica gel, and acrylate, and the specific structure of the sandwich 6 refers to the first embodiment.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. A three-dimensional chiral pressure-torsion structure is characterized in that the structure is formed by arranging and connecting a plurality of units in a three-dimensional direction,
the unit is regular hexahedron-shaped, each face of the unit includes: four first connecting rods with the same length, four disks with the same size and four second connecting rods with the same length,
the centers of the four disks are respectively positioned at the four corners of a square, the first connecting rod is connected between two adjacent disks, each disk is connected with one second connecting rod, one ends of the four second connecting rods, which are deviated from the disks, are respectively positioned at the four corners of the surface,
the first connecting rods are tangent to the two connected disks, the two opposite first connecting rods are parallel to each other, and the second connecting rods are tangent to the connected disks;
every the face is seen from the extroversion inwards, the second connecting rod winds the central axis of face extends according to the first direction is outwards slope, the first direction is clockwise or anticlockwise, every the first direction is unanimous.
2. The three-dimensional chiral pressure-torsion structure of claim 1, wherein four first links on one of the faces: are both located at the internal common tangent of the two disks to which they are attached.
3. The three-dimensional chiral pressure-torsion structure of claim 1, wherein four first links on one of the faces: are located at the outer common tangent of the two discs to which they are attached.
4. The three-dimensional chiral pressure-torsion structure of claim 1, wherein four first links on one of the faces: one pair of the opposite first connecting rods is positioned at the position of the internal common tangent of the two connected disks, and the other pair of the opposite second connecting rods is positioned at the position of the external common tangent of the two connected disks.
5. The three-dimensional chiral piezoelectric structure of claim 1, wherein when a plurality of the units are connected in a three-dimensional arrangement, a sphere is formed at the vertex of each connected unit.
6. The three-dimensional chiral pressure-torsion structure of claim 1, wherein the cross section of the first connecting rod and the second connecting rod is rectangular or circular.
7. The three-dimensional chiral pressure-torsion structure of claim 1, wherein the first connecting rod and the second connecting rod are linear, curved or spring-shaped.
8. The three-dimensional chiral pressure-torsion structure of claim 1, wherein a connecting line between centers of two disks at diagonal positions is located on a central symmetry line of the unit.
9. The three-dimensional chiral piezo-torsional structure of claim 1, wherein the three-dimensional chiral piezo-torsional structure is formed by 3D printing using a plurality of materials.
10. A sandwich structure, comprising: the sandwich structure comprises a first planar structure, a second planar structure and a sandwich core positioned between the first planar structure and the second planar structure, wherein the sandwich core adopts the three-dimensional chiral piezoelectric-torsional structure as claimed in any one of claims 1 to 9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112693108A (en) * | 2020-12-19 | 2021-04-23 | 复旦大学 | Space chiral pressure-torsion superstructure material |
| CN112917894A (en) * | 2021-01-21 | 2021-06-08 | 复旦大学 | High-strength chiral pressure-torsion superstructure material |
| CN113738802A (en) * | 2021-08-10 | 2021-12-03 | 西安交通大学 | Gradient pressure torsion energy storage vibration reduction structure |
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2019
- 2019-08-23 CN CN201921379094.2U patent/CN210461501U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112693108A (en) * | 2020-12-19 | 2021-04-23 | 复旦大学 | Space chiral pressure-torsion superstructure material |
| CN112693108B (en) * | 2020-12-19 | 2022-03-18 | 复旦大学 | Space chiral pressure-torsion superstructure material |
| CN112917894A (en) * | 2021-01-21 | 2021-06-08 | 复旦大学 | High-strength chiral pressure-torsion superstructure material |
| CN112917894B (en) * | 2021-01-21 | 2022-07-22 | 复旦大学 | Chiral pressure-torsion superstructure material |
| CN113738802A (en) * | 2021-08-10 | 2021-12-03 | 西安交通大学 | Gradient pressure torsion energy storage vibration reduction structure |
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