A nested discrete assembly mechanical metamaterial

Abstract

The present invention discloses a nested discrete assembly mechanical metamaterial, which is assembled by nesting an inner unit cell and an outer unit cell; the inner unit cell has an octahedron configuration and includes 3 ring blocks; the outer unit cell has a cube configuration and includes 6 cross-shaped sheets and 12 L-shaped corner codes; the inner unit cell and the outer unit cell are connected by a first bolt group and a second bolt group to form a complete mechanical metamaterial unit cell, or multiple mechanical metamaterial unit cells are periodically assembled by a third bolt group and a fourth bolt group to form a large-size mechanical metamaterial. The discrete unit cell parts can be mass-produced by traditional production processes, effectively reducing the production cost, and the discrete assembly method further eliminates the limitations of processing technology and processing dimensions.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical metamaterials, and more specifically, relates to a nested discrete assembly mechanical metamaterial. Background Art

[0002] Mechanical metamaterials, also known as mechanical metamaterials or superstructures, are a class of artificial materials that do not exist in nature but have special properties. By reasonably designing the internal microstructure or repeating unit configuration of the metamaterial, various properties of the metamaterial can be effectively regulated, such as negative Poisson's ratio, negative thermal expansion, light weight and high strength, etc. Mechanical metamaterials have broad application prospects in thermal and mechanical engineering applications.

[0003] Mechanical metamaterials have excellent mechanical properties, but still face the difficulties of complex geometric configurations, difficult property regulation, and difficult preparation by conventional processes. First, the coupling law between the functional characteristics and the structural geometric configuration of mechanical metamaterials is complex, and property regulation mainly depends on its geometric topology configuration. Therefore, how to realize the design of mechanical metamaterials with characteristics such as ultra-light, ultra-strong, and ultra-rigid has always been the goal pursued in science and engineering; second, conventional manufacturing processes, such as casting, thermal injection molding, machining, etc., are difficult to realize the preparation of parts with complex topological configurations. Therefore, the preparation of metamaterials mainly relies on additive manufacturing technology. However, special processes and equipment will lead to high processing costs of mechanical metamaterials, and are limited by the size of the equipment itself, making it difficult to produce large-size and large-batch mechanical metamaterials at low cost; third, as the requirements for structural performance and function become more and more stringent, parts prepared from homogeneous materials (structures are prepared from the same material) are difficult to meet the design requirements of products, but limited by the existing manufacturing processes, multi-material preparation technology has always been a challenging research topic in the field. In summary, how to realize the configuration design of high-performance mechanical metamaterials and break through the manufacturing process limitations is an urgent problem to be solved for metamaterials facing practical engineering applications. Summary of the Invention

[0004] Aiming at the defects or improvement requirements of the prior art, the present invention provides a nested discrete assembly mechanical metamaterial, which is assembled by an inner unit cell and an outer unit cell through bolts. The inner unit cell has an octahedron configuration and includes 3 ring blocks, and the outer unit cell has a cube configuration and includes 6 cross-shaped sheets and 12 L-shaped corner codes. The inner and outer unit cells are connected by a bolt group to form a complete unit cell, and multiple mechanical metamaterial unit cells can be periodically assembled and connected by a bolt group. The discrete unit cell parts can be prepared in large quantities by traditional production processes, effectively reducing the production cost, and the discrete assembly method further eliminates the limitations of the processing process and processing size. In addition, compared with the inner / outer mechanical metamaterial unit cells, the designed discrete assembly mechanical metamaterial has significantly enhanced mechanical properties and exhibits the mechanical characteristics of light weight and high strength.

[0005] To achieve the above technical effects, the present invention provides a nested discrete assembly mechanical metamaterial. A nested discrete assembly mechanical metamaterial is composed of an inner unit cell and an outer unit cell assembled in a nested manner; the inner unit cell has an octahedron configuration and includes 3 ring blocks; the outer unit cell has a cube configuration and includes 6 cross-shaped sheets and 12 L-shaped corner codes; the inner unit cell and the outer unit cell are connected by a first bolt group and a second bolt group to form a complete mechanical metamaterial unit cell, or multiple mechanical metamaterial unit cells are periodically assembled by a third bolt group and a fourth bolt group to form a large-size mechanical metamaterial.

[0006] The inner unit cell includes a first ring block, a second ring block and a third ring block; the outer shapes of the first ring block and the third ring block are square, and the outer shape of the second ring block is diamond-shaped; the ring blocks all have a certain thickness, and the 3 ring blocks are nested and assembled in a certain assembly sequence.

[0007] The first ring block and the third ring block have a centrosymmetric configuration and are respectively provided with 4 first mounting holes, and the first mounting holes are through holes and are arranged at the central positions of the short sides in the direction parallel to the x 、 y axis; the second ring block has an axisymmetric configuration and is provided with 4 second mounting holes, and the second mounting holes are through holes and are arranged at the central positions of the short sides in the direction parallel to the x 、 y axis.

[0008] The thickness of the long side of the ring block at a 45° angle with the x 、 y axis t is 1 / 30 to 1 / 10 of the outer side length dimension of the mechanical metamaterial unit cell; the thickness of the short side of the ring block parallel to the x 、 y axis w is 1 / 15 to 1 / 10 of the outer side length dimension of the mechanical metamaterial unit cell; the width of the short side of the ring block parallel to the x 、 y axis is the same as the width of the ring block h and is 1 / 15 to 1 / 6 of the outer side length dimension of the mechanical metamaterial unit cell.

[0009] The outer unit cell has a cube configuration, the cross-shaped sheet has a centrosymmetric configuration and has a certain thickness, and first sleeve mounting holes are respectively provided on the rods parallel to the x 、 y axis, and the first sleeve mounting holes are counterbore holes; a second sleeve mounting hole is provided at the center of the cross-shaped sheet, and the second sleeve mounting hole is a counterbore hole; the cross-shaped sheet is in the x 、 yThe side surface of the short side in the axial parallel direction is designed as a 45° mating inclined plane.

[0010] The outer dimension of the cross-shaped sheet l is the outer side length dimension of the unit cell of the mechanical metamaterial; the thickness of the cross-shaped sheet w is consistent with the thickness of the short side of the ring block, and its width h is consistent with the width of the ring block.

[0011] The L-shaped angle code is composed of two sheets at 90°. Each surface is provided with a third mounting hole having the same size as the mounting holes of the ring block and the cross-shaped sheet. The third mounting hole is a through hole with a diameter of 1 / 4 h -1 / 3 h .

[0012] The outer unit cell is fastened by using 12 sets of first bolt groups at the position of the first set of mounting holes with the cross-shaped sheet and the L-shaped angle code to form a complete outer unit cell; the inner unit cell and the outer unit cell are fastened by using 6 sets of second bolt groups at the position of the second set of mounting holes, thereby forming a complete unit cell of the mechanical metamaterial. Multiple unit cells of the mechanical metamaterial can be periodically assembled and connected by the third bolt group and the fourth bolt group to form a large-size mechanical metamaterial.

[0013] The volume fraction and performance of the unit cell of the mechanical metamaterial can be regulated by adjusting the sizes of the ring block and the cross-shaped sheet, and its volume fraction is controlled within the range of 0.1 to 0.5.

[0014] The discrete assembly metamaterial can also be assembled with parts of various materials. For example, the inner unit cell ring block, including the first ring block, the second ring block, the third ring block, and the cross-shaped sheet of the outer unit cell, can be prepared with materials of different properties respectively to form a multi-material discrete assembly mechanical metamaterial.

[0015] Generally speaking, compared with the prior art by the above technical solutions conceived by the present invention, the following technical advantages are mainly possessed:

[0016] 1. The present invention provides a nested discrete assembly mechanical metamaterial, which is nested and assembled by the inner unit cell and the outer unit cell of the metamaterial. According to the design idea of discrete-assembly, the inner and outer unit cell structures are discretized into multiple parts, and then assembled with the L-shaped angle code and the bolt group to form a complete unit cell of the mechanical metamaterial. Compared with the manufacturing process relying on additive manufacturing technology, the present invention can first be prepared by traditional low-cost and large-scale production processes such as thermoplastic injection molding and die stamping, and then mechanically assembled by bolt components, significantly reducing the preparation cost and production cycle.

[0017] 2. Meanwhile, the discrete assembly mechanical metamaterial provided by the present invention has a novel structural form, which is composed of the composite assembly of the internal unit cell and the external unit cell of the metamaterial. Compared with the simple internal / external unit cell of the metamaterial, the mechanical properties of the designed discrete assembly mechanical metamaterial are significantly enhanced. It has a low density, higher Young's modulus, bulk modulus, and shear modulus, and thus has the mechanical characteristics of light weight, ultra-high stiffness / strength, and high compressive resistance.

[0018] 3. In addition, the discrete assembly mechanical metamaterial provided by the present invention can cooperate with bolt groups of different lengths to achieve large-scale assembly of multiple unit cells, forming periodic mechanical metamaterials with arbitrary sizes and rich shapes. It breaks through the limitation of the manufacturable volume of the equipment itself, is easy to realize the preparation of large-size structures at the centimeter and meter levels, and overcomes the engineering application limitations of small-size mechanical metamaterials. At the same time, the discrete components can be prepared using a variety of materials according to design requirements, so as to flexibly adjust the performance of the mechanical metamaterial. Brief Description of the Drawings

[0019] The present invention will be further described below with reference to the drawings and embodiments.

[0020] Figure 1 It is a schematic diagram of the unit cell of the discrete assembly mechanical metamaterial provided by the present invention.

[0021] Figure 2 It is a schematic diagram of the internal unit cell of the mechanical metamaterial provided by the present invention.

[0022] Figure 3 It is a schematic diagram of the structural dimensions of the first ring block of the internal unit cell of the mechanical metamaterial provided by the present invention.

[0023] Figure 4 It is a schematic diagram of the structural dimensions of the second ring block of the internal unit cell of the mechanical metamaterial provided by the present invention.

[0024] Figure 5 It is a schematic diagram of the structural dimensions of the third ring block of the internal unit cell of the mechanical metamaterial provided by the present invention.

[0025] Figure 6 It is a schematic diagram of the assembly sequence of the ring blocks of the internal unit cell of the mechanical metamaterial provided by the present invention.

[0026] Figure 7 It is a schematic diagram of the external unit cell of the mechanical metamaterial provided by the present invention.

[0027] Figure 8 It is a schematic diagram of the cross-shaped sheet structure of the external unit cell of the mechanical metamaterial provided by the present invention.

[0028] Figure 9 It is a schematic diagram of the structural dimensions of the cross-shaped sheet structure of the external unit cell of the mechanical metamaterial provided by the present invention.

[0029] Figure 10 It is a schematic diagram of the L-shaped corner code structure provided by the present invention.

[0030] Figure 11 It is a schematic diagram of the assembly structure of two mechanical metamaterial unit cells in Preferred Embodiment 2 of the present invention.

[0031] Figure 12 It is the present invention Figure 8 A partial cross-sectional view of the assembly of two mechanical metamaterial unit cells in it.

[0032] Figure 13 It is a schematic diagram of the 3×3×3 order mechanical metamaterial unit cell in Preferred Embodiment 2 of the present invention.

[0033] Figure 14 It is a schematic diagram of the 3×3×3 order inner unit cell mechanical metamaterial in Preferred Embodiment 3 of the present invention.

[0034] Figure 15 It is a schematic diagram of the 3×3×3 order outer unit cell mechanical metamaterial in Preferred Embodiment 3 of the present invention.

[0035] Figure 16 It is a schematic diagram of the structure load and constraint settings in the finite element analysis in Preferred Embodiment 3 of the present invention.

[0036] Figure 17 It is a bar chart of the comparison of the equivalent moduli of different mechanical metamaterials in Preferred Embodiment 3 of the present invention.

[0037] In the figure: inner unit cell 1, first ring block 101, second ring block 102, third ring block 103, outer unit cell 2, cross-shaped sheet 201, first set of mounting holes 2011, second set of mounting holes 2012, L-shaped corner code 202, first bolt group 203, second bolt group 3, third bolt group 4, fourth bolt group 5, first mechanical metamaterial unit cell 6, second mechanical metamaterial unit cell 7. Detailed implementation manners

[0038] The following further describes the implementation manners of the present invention with reference to the accompanying drawings.

[0039] In order to more clearly elaborate the above-mentioned objects, features and advantages of the present application, the specific implementation manners of the present application are described in detail in this part with reference to the accompanying drawings. In addition to the various implementation manners described in this part, the present application can also be implemented in other different ways. Without departing from the spirit of the present application, those skilled in the art can make corresponding improvements, deformations and replacements. Therefore, the present application is not limited by the specific embodiments disclosed in this part. The protection scope of the present application shall be subject to the claims.

[0040] Embodiment 1:

[0041] SeeFigures 1 - 10 , the unit cell of the discrete assembly mechanical metamaterial provided by the present invention is assembled by the inner unit cell and the outer unit cell in the mechanical metamaterial unit cell through bolt groups of different lengths. The inner unit cell is composed of 3 ring blocks, and the outer unit cell is composed of 6 cross-shaped sheets and 12 L-shaped corner codes; the inner unit cell 1 is installed inside the outer unit cell 2, and multiple mechanical metamaterial unit cells can form a large-size mechanical metamaterial through bolt groups.

[0042] Further, the inner unit cell 1 is in an octahedron configuration, including a first ring block 101, a second ring block 102, and a third ring block 103; the first ring block 101 and the third ring block 103 are square in shape and have a certain thickness, including the x , y long side perpendicular to the x , y axis and the

[0043] short side parallel to the x , y axis.

[0044] Further, the first ring block 101 and the third ring block 103 are in a centrosymmetric configuration and are provided with 4 first mounting holes for connecting the ring block and the outer unit cell; the first mounting holes are through holes and are arranged at the central positions of the short sides parallel to the x , y axis and the x , y axis.

[0045] Further, the second ring block 102 is in an axisymmetric configuration and is provided with 4 second mounting holes for connecting the ring block and the outer unit cell; the second mounting holes are through holes and are arranged at the central positions of the short sides in the direction parallel to the x , y axis.

[0046] Further, the first ring block 101, the second ring block 102, and the third ring block 103 can be nested and assembled in a certain assembly sequence. Specifically, first determine the position of the first ring block 101, and then sequentially nest the second ring block 102 and the third ring block 103 to complete the assembly of the inner unit cell 1.

[0047] Further, the thickness of the long side of the ring block at a 45° angle to the x , y axis t is 1 / 30 to 1 / 10 of the side length dimension of the outer shape of the mechanical metamaterial unit cell; the thickness of the short side of the ring block parallel to the x , y axis wis 1 / 15 to 1 / 10 of the side length dimension of the unit cell of the mechanical metamaterial; the short side width of the ring block parallel to the x , y axis is consistent with the width of the ring block h and is 1 / 15 to 1 / 6 of the side length dimension of the unit cell of the mechanical metamaterial.

[0048] Further, the inner unit cell 1 is installed inside the outer unit cell 2, and the 4 short sides of the first ring block 101 are directly in contact and cooperate with the cross-shaped sheet 201, and its maximum outer dimension is l - 2 w , where w is the thickness of the cross-shaped sheet 201; the 2 short sides of the second ring block 102 are directly in contact and cooperate with the cross-shaped sheet 201, and the other 2 short sides are nested and installed inside the short sides of the first ring block 101, so its maximum outer dimensions are respectively l - 2 w , l - 4 w ; the 4 short sides of the third ring block 103 are nested inside the short sides of the first ring block 101 and the second ring block 102, so its maximum outer dimension is l - 4 w ,

[0049] Further, the outer unit cell 2 is in a cubic configuration, including 6 cross-shaped sheets 201 and 12 L-shaped corner codes 102; the cross-shaped sheet 201 is in a centrosymmetric configuration and has a certain thickness; the outer dimension of the cross-shaped sheet l is the side length dimension of the unit cell of the mechanical metamaterial; the thickness of the cross-shaped sheet is consistent with the short side thickness of the ring block w , and its width is consistent with the width of the ring block h .

[0050] Further, the short side sides of the cross-shaped sheet 201 in the x , y axis parallel direction are designed as 45° mating inclined planes to ensure the mutual assembly of different cross-shaped sheets.

[0051] Further, the L-shaped corner code 202 is composed of two sheets at 90°, and each surface is provided with a third mounting hole having the same size as the mounting holes of the ring block and the cross-shaped sheet. The third mounting hole is a through hole, and the diameter of the through hole is consistent with the diameter of the through holes provided on the ring block and the cross-shaped sheet, generally 1 / 4 h - 1 / 3 h .

[0052] Further, the cross-shaped sheet 201 and x , yOn the rods parallel to the axis, there are respectively first sets of mounting holes 2011, and the first sets of mounting holes are countersunk holes; the first sets of mounting holes 2012 are used in cooperation with 12 sets of first bolt groups 203 to fasten the cross-shaped sheet body 201 and the L-shaped angle code 202 to form the outer unit cell 2.

[0053] Furthermore, a second set of mounting holes 2012 is provided at the center of the cross-shaped sheet body 201, and the second set of mounting holes is a countersunk hole; after the inner unit cell 1 is assembled, the cross-shaped sheet body 201 of the outer unit cell 2 is assembled in sequence, and the inner unit cell 1 and the outer unit cell 2 are connected and assembled by 6 sets of second bolt groups 3 to form a complete mechanical metamaterial unit cell.

[0054] Furthermore, the volume fraction of the mechanical metamaterial unit cell can be regulated by adjusting the sizes of the ring blocks and the cross-shaped sheet bodies, and is controlled within the range of 0.1 to 0.5.

[0055] Example 2:

[0056] See Figures 11 - 13 , to realize the forming and preparation of multi-order large-size mechanical metamaterials, multiple metamaterial unit cells can be assembled periodically, so as to form large-size mechanical metamaterials with arbitrary sizes and rich shapes.

[0057] Specifically, as described in Example 1, the complete discrete assembly metamaterial unit cell is a spatially completely symmetric configuration, and each face contains 4 sets of first bolt groups 203 and 1 set of second bolt groups 3.

[0058] Furthermore, to realize the assembly of the first mechanical metamaterial unit cell 6 and the second mechanical metamaterial unit cell 7, first remove the original first bolt group 203 and the second bolt group 3 on the coincidence surface of the unit cells, and then install the third bolt group 4 at the position of the first set of mounting holes 2011 on the coincidence surface, and install the fourth bolt group 5 at the position of the second set of mounting holes 2012 on the coincidence surface; a total of 4 sets of third bolt groups 4 and 1 set of fourth bolt groups 5 are installed on the mating surfaces of the two unit cells.

[0059] Furthermore, according to the same assembly method, large-size mechanical metamaterials with multi-orders and different structural forms can be realized. Figure 13 Schematic diagram of the 3×3×3 order mechanical metamaterial unit cell structure given by the present invention.

[0060] Example 3:

[0061] See Figures 14 - 17 , to illustrate the mechanical property advantages of the nested discrete assembly mechanical metamaterials provided by the present invention, finite element analyses are respectively carried out on the inner unit cell mechanical metamaterials, the outer unit cell mechanical metamaterials and the nested discrete assembly mechanical metamaterial unit cells of the same size of 3×3×3 order.

[0062] Furthermore, the 3×3×3 order internal unit cell mechanical metamaterial is assembled from the first ring block 101, the second ring block 102, the third ring block 103 of the internal unit cell 1 and a certain number of bolt groups; the 3×3×3 order external unit cell mechanical metamaterial is assembled from the cross-shaped sheet 201, the L-shaped angle code 202, and the first bolt group 203 of the external unit cell 2.

[0063] Furthermore, in the finite element analysis, the dimensions given for the structure are l = 60 mm. To avoid the influence of the connection components on the structural performance, the materials of the L-shaped angle code and the bolt group are defined as structural steel, and the materials of the ring block and the cross-shaped sheet are defined as nylon PA2200. The properties of the materials are: the density is 1020 kg / m 3 , the elastic modulus is 741 MPa, and the Poisson's ratio is 0.3.

[0064] Furthermore, Figure 16 Shown are the load and fixed constraint positions of the unit cell of the mechanical metamaterial during finite element analysis. The load is applied to the upper surface of the unit cell of the mechanical metamaterial, and the lower surface of the unit cell of the mechanical metamaterial is a fixed constraint.

[0065] Furthermore, according to the finite element calculation results, a comparison bar chart of the equivalent Young's modulus, bulk modulus, and shear modulus of the three types of metamaterial unit cells is drawn, as shown in Figure 17 Shown. It can be seen from the equivalent modulus of the structure calculated by finite element that, compared with the internal / external unit cell mechanical metamaterial, the nested discrete assembly mechanical metamaterial designed by the present invention has remarkable super-rigidity / strength and high anti-compression characteristics.

[0066] Example 4:

[0067] The discrete assembly metamaterial provided by the present invention has the structural advantages of discrete-assembly. Except that the internal / external unit cells in Example 3 are made of the same material, the discrete assembly metamaterial can also be assembled with parts of multiple materials.

[0068] Furthermore, for example, the internal unit cell ring blocks, including the first ring block 101, the second ring block 102, the third ring block 103, and the external unit cell cross-shaped sheet 201 can be prepared from materials with different properties and then assembled to achieve the mechanical property regulation of the mechanical metamaterial from the perspective of multiple materials.

Claims

1. A nested discrete assembly mechanical metamaterial, characterized in that, The mechanical metamaterial is assembled by nesting an inner unit cell (1) and an outer unit cell (2); the inner unit cell (1) is in an octahedron configuration and includes 3 ring blocks; the outer unit cell (2) is in a cube configuration and includes 6 cross-shaped sheets (201) and 12 L-shaped corner codes (202); the inner unit cell (1) and the outer unit cell (2) are connected by a first bolt group (203) and a second bolt group (3) to form a complete mechanical metamaterial unit cell, or multiple mechanical metamaterial unit cells are periodically assembled by a third bolt group (4) and a fourth bolt group (5) to form a large-sized mechanical metamaterial; A second set of mounting holes (2012) is provided at the center of the cross-shaped sheet (201); The inner unit cell (1) and the outer unit cell (2) are fastened at the position of the second set of mounting holes (2012) using 6 sets of second bolt groups (3), thereby forming a complete mechanical metamaterial unit cell.

2. The nested discrete assembly mechanical metamaterial according to claim 1, characterized in that The inner unit cell (1) includes a first ring block (101), a second ring block (102), and a third ring block (103); the outer shapes of the first ring block (101) and the third ring block (103) are square, and the outer shape of the second ring block (102) is diamond-shaped; the ring blocks all have a certain thickness, and the 3 ring blocks are nested and assembled in a certain assembly order.

3. The nested discrete assembly mechanical metamaterial according to claim 2, characterized in that, The first ring block (101) and the third ring block (103) are in a centrosymmetric configuration and are respectively provided with 4 first mounting holes, the first mounting holes are through holes, and are arranged at the center positions of the short sides in the directions parallel to the x and y axes; the second ring block (102) is in an axisymmetric configuration and is provided with 4 second mounting holes, the second mounting holes are through holes, and are arranged at the center positions of the short sides in the directions parallel to the x and y axes.

4. A nested discrete assembly mechanical metamaterial according to claim 1, characterized in that, The thickness t of the long side of the ring block at a 45° angle to the x and y axes is 1 / 30 to 1 / 10 of the outer side length dimension of the mechanical metamaterial unit cell; the thickness w of the short side of the ring block parallel to the x and y axes is 1 / 15 to 1 / 10 of the outer side length dimension of the mechanical metamaterial unit cell; the width of the short side of the ring block parallel to the x and y axes is the same as the width h of the ring block, and is 1 / 15 to 1 / 6 of the outer side length dimension of the mechanical metamaterial unit cell.

5. A nested discrete assembly mechanical metamaterial according to claim 1, characterized in that, The outer unit cell (2) is in a cube configuration, the cross-shaped sheet (201) is in a centrosymmetric configuration and has a certain thickness, and first sets of mounting holes (2011) are respectively provided on the rods parallel to the x and y axes, the first sets of mounting holes (2011) are countersunk holes; the second sets of mounting holes (2012) are countersunk holes; the sides of the short sides of the cross-shaped sheet (201) in the directions parallel to the x and y axes are designed as 45° mating inclined surfaces.

6. The nested discrete assembly mechanical metamaterial according to claim 1, characterized in that, The outer dimension l of the cross-shaped sheet (201) is the outer side length dimension of the mechanical metamaterial unit cell; the thickness w of the cross-shaped sheet (201) is the same as the short side thickness of the ring block, and its width h is the same as the width of the ring block.

7. A nested discrete assembly mechanical metamaterial according to claim 1, characterized in that, The L-shaped corner code (202) is composed of two 90° sheets, and third mounting holes with the same size as the mounting holes of the ring block and the cross-shaped sheet are provided on each surface, the third mounting holes are through holes, and their diameter is 1 / 4h - 1 / 3h.

8. A nested discrete assembly mechanical metamaterial according to claim 1, characterized in that, The outer unit cell (2) is fastened by a cruciform sheet (201) and an L-shaped angle code (202) at the position of the first set of mounting holes (2011) using 12 sets of first bolt groups (203) to form a complete outer unit cell; multiple mechanical metamaterial unit cells can be periodically assembled and connected by a third bolt group (4) and a fourth bolt group (5) to form a large-size mechanical metamaterial.

9. A nested discrete assembly mechanical metamaterial according to claim 1, characterized in that, The volume fraction and properties of the mechanical metamaterial unit cell can be regulated by adjusting the dimensions of the ring block and the cruciform sheet, and its volume fraction is controlled within the range of 0.1 to 0.

5.

10. A nested discrete assembly mechanical metamaterial according to claim 1, characterized in that, The discrete assembly metamaterial can also be assembled using parts of various materials. For example, the inner unit cell ring block, including the first ring block (101), the second ring block (102), the third ring block (103), and the outer unit cell cruciform sheet (201), can be prepared using materials with different properties to form a multi-material discrete assembly mechanical metamaterial.

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