A chiral compression-torsion structure with ultra-large deformation

Abstract

The present invention belongs to the field of metamaterial technology, specifically a chiral compression-torsion superstructure with super large deformation. The chiral compression-torsion superstructure of the present invention is formed by stacking a number of cells; each cell is a space cube formed by combining six in-plane beams of the same structure; each in-plane beam is a hollow square with four corners with arc transitions formed by combining four straight beams and four curved beams; wherein one end of the four curved beams is fixed at a central circular hole, and the beam bodies are affinely arranged at equal intervals outside, and the bending directions of the beams are consistent, and the other ends of the four curved beams are located at the end points of a square; one end of the four straight beams is respectively connected to the outer ends of the four curved beams, and the other ends are respectively tangently connected to the arcs of the four curved beams, so that the four corners of the square are arc-shaped. The structure of the present invention can produce large-scale and stable torsional deformation under pressure, and the torsional direction can be adjusted by the chiral direction. It can be used in industries such as architectural design and mechanical structure.

Description

Technical Field

[0001] The invention belongs to the technical field of metamaterials, and in particular relates to a chiral compression-twist structure. Background Art

[0002] Mechanical metamaterials (superstructures) refer to periodic spatial structures of materials that are artificially designed to have extraordinary mechanical properties, such as special mechanical properties such as compression torsion, negative Poisson's ratio and zero expansion. This property depends not only on the properties of the material itself, but also on the artificially designed periodic microstructure. The emergence of metamaterials enables humans to design and manufacture materials that better meet industrial needs.

[0003] The invention provides a mechanical superstructure which generates ultra-large torsional deformation after being axially compressed. Summary of the invention

[0004] The purpose of the present invention is to provide a chiral compression-torsion structure which produces stable and ultra-large torsional deformation after being axially compressed.

[0005] The chiral compression-torsion superstructure proposed in the present invention undergoes stable and significant torsional deformation when subjected to compression. It is composed of a number of stacked cells; each cell is a spatial cube composed of six in-plane beams of the same structure, such as Figure 3 As shown in the figure, each in-plane beam is composed of four straight beams and four curved beams, and is a hollow square with four corners that are arc-shaped transitions. One end of the four curved beams is fixed at a central circular hole, and the beam bodies are affinely arranged with equal spacing outside, and the bending directions of the beams are consistent. One end of the four curved beams is located at the end point of a square; one end of the four straight beams is respectively connected to the outer ends of the four curved beams, and the other end is respectively connected to the arcs of the four curved beams tangently, so that the four corners of the square are arc-shaped. The in-plane beam structure is as shown in the figure. Figure 1 shown.

[0006] The preparation method can be 3D printing additive manufacturing, or it can be achieved by casting, welding, cutting and other methods.

[0007] The preparation material is required to have good elasticity and toughness, such as TPU.

[0008] For example, the drawings are printed by 3D printing additive manufacturing, using water-soluble supports. After printing, they are immersed in water, the support materials are removed, and then dried. Axial compression and torsion can be achieved by applying pressure.

[0009] The advantages of the present invention are as follows:

[0010] 1. The structure of the present invention can produce a large and stable torsion phenomenon under pressure, and the torsion direction can be adjusted by the chirality direction;

[0011] 2. The torsion angle is flexible and controllable, such as quickly and accurately adjusting it by increasing or decreasing the number of layers;

[0012] 3. There are many ways to adjust the maximum compression and torsion angle, such as adjusting the thickness of the beam and the number of horizontal stacking.

[0013] Compared with existing compression-torsion superstructures, the chiral compression-torsion structure proposed in the present invention can produce a larger range of stable torsional deformation and can be applied to a wider range of industrial application scenarios, such as architectural design, mechanical structure and other industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the in-plane structure.

[0015] Figure 2 It is the three-view drawing of the in-plane structure.

[0016] Figure 3 Schematic diagram of the cell structure.

[0017] Figure 4 It is the three-view diagram of the cell.

[0018] Figure 5 This is a schematic diagram of a 1×1×2 stack.

[0019] Figure 6 It is a 1×1×2 stacked three-view drawing.

[0020] Figure 7 This is a schematic diagram of a 4×4×8 stack.

[0021] Figure 8 It is a 4×4×8 stacked three-view image.

[0022] Fig. 9 This is a schematic diagram of the initial compression of the 1×1×2 stack in Example 1.

[0023] Fig.10 Schematic diagram of the 1×1×2 stack under compression and torsion in Example 1.

[0024] Fig.11 This is an initial oblique view of the 4×4×8 stack under compression in Example 2.

[0025] Fig.12 This is an oblique view of the 4×4×8 stack under compression and torsion in Example 2.

[0026] Fig.13 This is the initial front view of the 4×4×8 stack under compression in Example 2.

[0027] Fig.14 This is the front view of the 4×4×8 stack under compression and torsion in Example 2.

[0028] Fig.15 This is the initial top view of the 4×4×8 stack under compression in Example 2.

[0029] Fig.16 This is a top view of the 4×4×8 stack under compression and torsion in Example 2.

[0030] Fig.17 Schematic diagram of the 4×4×8 stacking torsion angle in Example 2. DETAILED DESCRIPTION

[0031] Embodiment 1:

[0032] Printed using a 3D printer, the material used is TPU95A, and the water-soluble support material used is PVA.

[0033] Example 1 In-plane structure Figure 2 As shown in Figure 1, its main structure consists of four straight beams and four curved beams. Figure 1 As shown, the four bent beams have a width of 2 mm and a thickness of 2 mm. One end is located at a circular hole with a central diameter of 2 mm, and the other end is located at the end point of a square with a side length of 36 mm. One end of the four straight beams is located at the end point of the square, and the other end is tangent to the bent beam. The arc radius of the bent beam is about 11.7 mm.

[0034] In Example 1, the cell is as follows Figure 3 As shown, the cell is a spatial cube composed of 6 in-plane beam structures with the same structure.

[0035] Stack two cells up and down, such as Figure 5 shown.

[0036] Print using 3D printing additive manufacturing, soak the printed part in water, replace it with clean water when the water becomes turbid until the PVA support disappears completely, and then dry it.

[0037] The compression-torsion superstructure undergoes obvious torsion after being compressed, such as Fig. 9 , Fig.10 shown.

[0038] Embodiment 2:

[0039] Example 2, the in-plane structure of Example 1 is as follows Figure 2 As shown in Figure 1, its main structure consists of four straight beams and four curved beams. Figure 1 As shown, the four bent beams are 1mm wide and 1mm thick, with one end located at a circular hole with a central diameter of 1mm and the other end located at the end point of a square with a side length of 18mm. One end of the four straight beams is located at the end point of the square and the other end is tangent to the bent beam. The radius of the bent beam is about 5.9mm.

[0040] The manufacturing method of Example 2 is the same as that of Example 1, so it will not be repeated here.

[0041] In Example 2, the cells are stacked in 4×4×8, such as Figure 8 As shown, this stack is a structure consisting of 128 cells arranged in 4 rows, 4 columns, and 8 layers.

[0042] The 4×4×8 stacked compression-torsion superstructure undergoes obvious torsion after being compressed, such as Fig.11 , Fig.12 , Fig.13 , Fig.14 , Fig.15 , Fig.16 and Fig.17 shown.

[0043] Depend on Fig.13 , Fig.14 The measurable downward pressure distance is about 5.18mm, and the strain is 3.59%. Fig.17 The measurable torsion angle is about 28°, the radian is 0.49, and the calculated angle to strain ratio is 7.80° / %, and the radian ratio is 0.136 / %.

[0044] Note: This structure is dimensionless and can be applied to any scale.

Claims

1. A chiral compression-torsion superstructure with ultra-large deformation, characterized in that: It is composed of a number of stacked cells; each cell is a spatial cube formed by the combination of six in-plane beams of the same structure; each in-plane beam is a hollow square with four corners being arc-shaped transitions, which is composed of four straight beams and four curved beams; one end of the four curved beams is fixed at a central circular hole, and the beam bodies are affinely arranged at equal intervals outward, and the bending directions of the beams are consistent, and the other ends of the four curved beams are located at the end points of a square; one end of the four straight beams is respectively connected to the outer end portions of the four curved beams, and the other ends are respectively connected to the arcs of the four curved beams tangently, so that the four corners of the square are arc-shaped.

2. The method for preparing a chiral compression-torsion superstructure with ultra-large deformation according to claim 1, characterized in that: Use 3D printing additive manufacturing, or casting, welding and cutting.

3. The method for preparing a chiral compression-torsion superstructure with ultra-large deformation according to claim 2, characterized in that: When using 3D printing additive manufacturing, water-soluble supports are used; after printing, they are immersed in water, and the support material is removed and then dried.

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