Negative Poisson's ratio structure based on rotating rod unit

Abstract

The invention discloses a negative Poisson's ratio structure based on a rotating rod unit. The structure comprises a plurality of rotating rod units, wherein the plurality of rotating rod units are periodically arranged and combined in a plane; each rotating rod unit comprises two flexible curved beam units, four bent rods and two straight rods, wherein the two flexible curved beam units are connected between the two straight rods and are symmetrically distributed, the four bent rods are connected to the two flexible curved beam units and are symmetrically distributed, the rotating rod units which are adjacent left and right are directly connected through symmetrical bent rod end parts, and the rotating rod units which are adjacent up and down are directly connected through symmetrical straight rod end parts. The negative Poisson's ratio structure based on the rotating rod unit is simple and effective and good in manufacturability, and has the advantages of being small in stress concentration force and facilitating energy storage and conversion.

Description

technical field [0001] The invention relates to the technical field of mechanical metamaterial structure design, in particular to a negative Poisson's ratio structure based on a rotating rod unit. Background technique [0002] Compared with traditional materials, negative Poisson's ratio materials have unique mechanical properties, such as expanding when stretched and shrinking when compressed, and they are also more advantageous in terms of shear capacity, fracture resistance, energy absorption, and indentation resistance. . Negative Poisson's ratio materials exhibit physical properties such as light weight, high damping, sound absorption, and heat insulation, which play an important role in functional materials and have been applied in medical and aerospace fields, such as smart medical bandages, esophageal stents, and negative Poisson's ratio honeycomb chord side protection structure, etc. [0003] However, the types of existing negative Poisson's ratio materials are li...

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Problems solved by technology

[0003] However, the types of existing negative Poisson's ratio materials are limited, and there is little choice in application, and the unit structure is becoming more and more complex, making the preparation more difficult, which limits its practical application.

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