Combined structure with negative Poisson's ratio effect

Abstract

The invention discloses a combined composite structure with a negative Poisson's ratio effect. The combined composite structure comprises corrugated plates and square pipes, wherein the corrugated plates and the square pipes are arranged to realize the negative Poisson's ratio effect of the whole structure, firstly, the size of the corrugated plates, the size of the square pipe and the overall size are designed; secondly, according to actual stress requirements or application scenes, materials of the corrugated plates and the square pipes are selected, the materials of the corrugated plates need to have certain ductility, large-deformation bending can be achieved, the square pipes do not have specific requirements, and stable connection with the corrugated plates can be achieved; then, according to the connection sequence required by the design, a proper connection method is selected for connection, and the connection method can be adopted such as bonding, welding and riveting. The combined composite structure is proved to have very high novelty and practicability, has the variable stiffness characteristic while achieving the negative Poisson's ratio effect, and has great application potential in the fields of impact protection, aerospace, sensors and the like.

Description

technical field [0001] The invention relates to a combined structure with negative Poisson's ratio effect designed by assembling corrugated plates and square tubes, belonging to the field of new materials and new structures. Background technique [0002] Unlike most materials in nature, negative Poisson's ratio materials or structures contract when compressed and expand when tensioned. This special mechanical behavior makes negative Poisson's ratio materials or structures exhibit many ideal mechanical properties, which are better than positive Poisson's ratio materials in terms of shear bearing capacity, fracture resistance, energy absorption capacity, and anti-sag performance. There is a certain degree of improvement. These excellent mechanical properties also make negative Poisson's ratio materials and structures have great application potential in medical, aerospace, impact protection, sensors and other fields. Negative Poisson's ratio materials and structures are also ...

AI Technical Summary

Problems solved by technology

However, due to the complex topology of negative Poisson’s ratio structures, most of the existing negative Poisson’s ratio structures are based on high-cost manufacturing processes such as 3D printing technology, laser cutting technology

The high-cost manufacturing process also limits the promotion and practical application of negative Poisson's ratio structures, and reducing the manufacturing cost of negative Poisson's ratio structures has become a hot issue in the field

3D printing technology and laser cutting technology have relatively high requirements on the substrate, and the manufacturing size also has corresponding requirements. Therefore, most of the negative Poisson's ratio structures are still in the manufacture of smaller-sized components, and it is difficult to achieve negative Poisson's ratio. Application of structures in larger projects and fields

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