Ultra-light high-rigidity negative poisson ratio metamaterial structure and optimization design method thereof

Abstract

The invention discloses an ultra-light high-rigidity negative Poisson's ratio metamaterial structure and an optimization design method thereof.The ultra-light high-rigidity negative Poisson's ratio metamaterial structure comprises at least one basic module which can be spliced with each other, and each basic module is formed by splicing an internal unit and a plurality of external units; the internal unit and the multiple external units are integrally of a beam frame structure, the internal unit comprises an upper base body, a lower base body and a combination part used for connecting the upper base body and the lower base body, and the upper ends and the lower ends of the multiple external units are connected with the upper base body and the lower base body correspondingly; adjacent external units are connected with each other, so that the internal unit is connected with each connecting part in the plurality of external units to form a cubic octahedral structure, and at least part of each external unit is recessed into the three-dimensional octahedral structure. The manufacturing difficulty and the design difficulty of the negative Poisson's ratio metamaterial are reduced.

Description

Technical field [0001] The present invention relates to the field of metamaterial technology, in particular to an ultra-light high stiffness negative Poisson ratio metamaterial structure and an optimal design method thereof. Background [0002] Negative Poisson ratio material is a mechanical metamaterial, its mechanical characteristics are when the axial force compression, transverse is not stretched like other traditional materials, but will also compress, when the axial stretch, the horizontal expansion, with synchronous change effect; compared to the positive Poisson ratio material has good impact resistance, shear resistance, break resistance, dent resistance, sound absorption and energy absorption, curved isotropy and so on. [0003] At present, most of the negative Poisson ratio materials used additive manufacturing methods, or overall structural design, which has great limitations in the manufacture of mechanical metamaterials, not only manufacturing is very difficult, bu...

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Problems solved by technology

[0003] At present, most negative Poisson's ratio materials are manufactured using additive manufacturing or overall structural design. This method has great limitations in the manufacture of mechanical metamaterials. Not only is it very difficult to manufacture, but it can only be manufactured partially. The degree is low, because the manufacturable volume is too small, it is difficult to apply to the macroscopic system

Increased manufacturing difficulty will also limit the design of negative Poisson's ratio mechanical metamaterials

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