A three-dimensional star-shaped negative Poisson's ratio energy-absorbing lattice metamaterial

CN117823556BActive Publication Date: 2026-06-30ZHENGZHOU UNIV

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: ZHENGZHOU UNIV
Filing Date: 2023-12-13
Publication Date: 2026-06-30

AI Technical Summary

Technical Problem

In existing technologies, the energy absorption effect of three-dimensional negative Poisson's ratio lattices needs to be improved, and there are difficulties in manufacturing complex three-dimensional negative Poisson's ratio structures, making it difficult to meet the needs of multi-dimensional applications.

Method used

Design a three-dimensional star-shaped negative Poisson's ratio energy-absorbing lattice metamaterial. The unit cells are connected by diagonal rods to form a star-shaped or star-like structure. The concave points and convex points on the unit cells correspond to each other to form a periodically arranged lattice structure.

Benefits of technology

It improves energy absorption protection, increases impact resistance, prolongs impact time, reduces peak impact force, provides better protection, and has higher in-plane Young's modulus and out-of-plane strength at the same relative density, outperforming the resilience and impact resistance of traditional structures.

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Abstract

This invention belongs to the field of composite material design and manufacturing technology, specifically relating to a three-dimensional star-shaped negative Poisson's ratio energy-absorbing lattice metamaterial. The proposed three-dimensional star-shaped negative Poisson's ratio unit cell structure includes two vertically arranged unit cells connected by diagonal rods. Each unit cell is composed of multiple connecting rods connected end-to-end. The shape of each unit cell is star-shaped or quasi-star-shaped. With the geometric center of each unit cell as the center, the connection points of the connecting rods form at least two circles of different diameters. The connection point of the circle with the shortest diameter is a concave point, and the connection point of the circle with the longest diameter is a convex point. One unit cell is rotated relative to the other unit cell around its geometric center by a certain angle, so that the concave points and convex points on different unit cells correspond. The diagonal rods connect the corresponding concave points and convex points. This invention can improve its energy absorption and protection effect.

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