Novel metamaterial with multistable state and negative Poisson's ratio performance

By designing a novel metamaterial with both multi-stable and negative Poisson's ratio properties, and utilizing the synergistic design of a concave hexagonal frame and an arc beam, combined with highly elastic and highly rigid materials, efficient energy dissipation and self-recovery under external impact are achieved. This solves the problem of existing protective structures being easily damaged and difficult to reuse, and improves protective performance and shear resistance.

CN122129512APending Publication Date: 2026-06-02INNER MONGOLIA METAL MATERIAL RES INST
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Patent Information

Application Number
CN202610544977.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-23
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing protective structures have limited buffering efficiency when facing external threats such as vibration and impact, are prone to permanent damage and are difficult to reuse, and cannot achieve high energy dissipation and self-recovery.

Method used

A novel metamaterial with both multi-stable and negative Poisson's ratio properties is designed. Through the synergistic design of a concave hexagonal frame and an arc beam, combined with highly elastic and highly rigid materials, the arc beam achieves multi-stage deformation and energy dissipation, and recovers its original shape after impact.

Benefits of technology

It significantly improves protective performance and energy absorption rate, enables the structure to self-recover and be reused under complex working conditions, and enhances shear resistance and indentation resistance.

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Abstract

The invention relates to the field of novel materials, in particular to a novel metamaterial with multistable state and negative Poisson's ratio performance, which is composed of a concave hexagonal frame, two arc-shaped beams respectively arranged on the upper side and the lower side of an inner cavity of the frame, and a vertical rod. The two arc-shaped beams are fixedly connected with the upper end and the lower end of the vertical rod through the corresponding center portions respectively. When the structure is subjected to a vertical compression load, the frame inclined struts rotate and contract inwards and extrude the ends of the arc-shaped beams, and a remarkable negative Poisson's ratio effect is generated. The process forces the arc-shaped beam to be bent and deformed towards the center along with energy dissipation. And when the displacement reaches a critical threshold value, the arc-shaped beam is bent and overturned and is switched to a steady state. According to the invention, through a specific geometric configuration and material differentiation layout, form self-repairing of the structure after impact and reutilization under a low-strength working condition are realized, and the metamaterial can be used as a unit cell for two-dimensional periodic array arrangement.
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