Method for constructing three-dimensional negative poisson ratio structure based on regular tetrahedron frame
A technology of negative Poisson's ratio and positive tetrahedron, which is applied in the field of constructing a three-dimensional negative Poisson's ratio structure based on a positive tetrahedral framework, can solve problems such as quantitative control, difficult nature of negative Poisson's ratio, and failure to meet application requirements well. To achieve the effect of enhancing the mechanical properties of materials
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Embodiment 1
[0039] A method for constructing a three-dimensional negative Poisson's ratio structure based on a positive tetrahedron framework, comprising the following steps:
[0040] A. Define basic hexahedron unit parameters: each hexahedron unit is composed of six surface crease lines and eight outer boundary lines, and the plane parameters of each hexahedron unit are: A(0, 86.603, -50); B(50, 86.603 ,0);C(50,0,-50);D(50,-86.603,0);E(0,-86.603,-50);F(-50,-86.603,0);G(-50 , 0, -50); H (-50, 86.603, 0); O (0, 0, 0); A' (0, 86.603, -70); B' (50, 86.603, -20); C' (50, 0, -70); D'(50, -86.603, -20); E'(0, -86.603, -70); F'(-50, -86.603, -20); G'(- 50, 0, -70); H'(-50, 86.603, -20); O'(0, 0, -20); obtain a hexahedron unit entity with a thickness of 0.2;
[0041] B. Stacking the hexahedron unit entity: the 7×3 hexahedron unit array constructed in step A is formed into a planar plate structure, and the two planar plates are combined in pairs with a dihedral angle of 35.264°, and one of the p...
Embodiment 2
[0049] Embodiment 2 is the space expansion of the negative Poisson's ratio structure of the three-dimensional repeated tetrahedron frame
[0050] Such as Figure 6 The difference between the shown embodiment 2 and the embodiment 1 is that in step B, the three-dimensional negative Poisson’s ratio structure is stacked in space along the three directions of x, y, and z in 2×2×2 to form a negative Poisson’s ratio structure assembly , build its model in standard CAD software. Using TPU consumables for 3D printing manufacturing, the printing process settings are as follows:
[0051]
[0052] The 2×2×2 negative Poisson’s ratio structure-space assembly has a good shape, and the quantitative control of its negative Poisson’s ratio properties can also be realized by adjusting the thickness of the hexahedron unit.
[0053] A further preferred solution is that the negative Poisson's ratio structural space combination can adopt any number of regular tetrahedral frame combinations, and...
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