Programmable bionic negative poisson ratio structure and design method

Abstract

The invention discloses a programmable bionic negative poisson ratio structure. The programmable bionic negative poisson ratio structure comprises a skin and bionic negative poisson ratio structure cells. The programmable bionic negative poisson ratio structure is characterized in that the bionic negative poisson ratio structure cells are regularly and sequentially arranged and connected; each bionic poisson ratio structure cell is composed of an upper cell wall, a middle cell wall, a lower cell wall and a cell cavity, wherein the cell cavity is located in space defined by the upper cell wall, the middle cell wall and the lower cell wall; the bionic negative poisson ratio structure cells are of a longitudinal axisymmetric structure. The invention further discloses a design method for the programmable bionic negative poisson ratio structure. The bionic negative poisson ratio structure designed through the method has a better negative poisson ratio structure character and energy absorbing performance, the stress concentration problem of the structure can be remarkably reduced, programmable design of design parameters of the bionic poisson ratio structure can be quickly achieved through the design method, and therefore performance of components is further improved according to different application objects.

Description

Technical field [0001] The invention belongs to the field of negative Poisson's ratio structure design, in particular to a programmable bionic negative Poisson's ratio structure and design method. Background technique [0002] When a material with a negative Poisson's ratio structure is stretched in the axial direction, the material expands in the direction perpendicular to the force; when compressed in the axial direction, the material shrinks in the direction perpendicular to the external force. Due to the new characteristics of the material itself, the mechanical properties of negative Poisson's ratio materials, such as shear modulus and indentation resistance, have been enhanced. At the same time, negative Poisson's ratio materials also exhibit enhanced stiffness and higher energy absorption characteristics. . Materials with negative Poisson’s ratio structure have higher energy absorption characteristics during compression or collision. Appropriate application of this charac...

AI Technical Summary

Problems solved by technology

Although the double-arrow-type negative Poisson's ratio structure has made significant progress in performance and application, the negative Poisson's ratio structure is prone to stress concentration at the junction of the basic units, resulting in poor durability and reliability; At the same time, the energy absorption performance of the double-arrow negative Poisson's ratio structure and the specific energy absorption of the parts need to be further strengthened and improved, and its performance is difficult to program according to different application objects, thus limiting the performance of the applied parts

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