Impact-resistant and high-energy-absorption lattice sandwich structure with negative poisson ratio characteristic

Abstract

The invention discloses an impact-resistant and high-energy-absorption lattice sandwich structure with a negative poisson ratio characteristic. The lattice sandwich structure is formed on the basis ofa high-performance negative poisson ratio lattice core material. The negative poisson ratio lattice core material is obtained by changing an included angle between a supporting column and a coordinate axis through a three-dimensional cubic structure. When the included angle between the supporting column and the coordinate axis is not equal to zero, the negative poisson ratio lattice core materialis obtained. The negative poisson ratio lattice material and two thin plates form a novel negative poisson ratio lattice sandwich structure, and the structure has the characteristics of a traditionalauxetic lattice structure and a traditional lattice sandwich structure at the same time, that is, the structure has the characteristics of the negative poisson ratio and the same-direction curvature;meanwhile, has excellent mechanical properties such as ultra-light weight, high specific modulus, high specific strength, impact resistance and high energy absorption. In addition, the sandwich structure has high adjustability, and the mechanical property of the lattice sandwich structure can be adjusted and controlled within a large range by adjusting the deflection angle of the supporting column and the relative density of the lattice material. The lattice sandwich structure has a great application prospect in the field of aerospace.

Description

technical field [0001] The invention relates to a lattice sandwich structure, in particular to an impact-resistant and high energy-absorbing lattice sandwich structure with negative Poisson's ratio characteristics. Background technique [0002] With the continuous development of the aerospace industry, the unique mechanical environment (such as: aerodynamic heat, vibration, atmospheric pulsation pressure, etc.) and performance requirements (such as: hypersonic speed, high maneuverability, long-range strike, etc.) New topics have been proposed: lightweight structure, multi-functional structure and optimized structure design, etc. Among them, lightweight structure design is the eternal pursuit and design key of aerospace structure design. Due to its light weight, high specific stiffness, high specific strength, high toughness, high energy absorption and other excellent mechanical properties, the porous sandwich structure has received extensive attention in the aerospace field....

AI Technical Summary

Problems solved by technology

On the other hand, negative Poisson's ratio lattice materials often produce auxetic effects based on the bending deformation or rotational deformation of the pillars, but these two deformation mechanisms weaken the load-bearing capacity of the material to a certain extent

These two contradictory conclusions hinder the application of negative Poisson's ratio lattice sandwich structures

Images