Hierarchical negative stiffness mechanical metamaterials

Abstract Negative stiffness mechanical metamaterials have enormous application potential in fields such as energy absorption due to their unique mechanical properties. Currently, a large number of negative stiffness mechanical metamaterials with novel configurations have been proposed, greatly enriching the concept of such structural materials. However, the hierarchical structural design approach, commonly used in periodic structures, has not been applied in the design of negative stiffness mechanical metamaterials. This study proposes a new type of negative stiff ness mechanical metamaterial with hierarchical structural characteristics. Through experiments and numerical simulations, the mechanical properties and energy absorption performance of this hierarchical negative stiffness metamaterial were studied. The effects of structural parameters on the performance characteristics were analyzed, and a comparison was made between this hierarchical structure and traditional structures. The study shows that the hierarchical design can effectively optimize the mechanical response curve of negative stiffness mechanical metamaterials, constructing a flatter stress platform, which promotes the enhancement of energy absorption performance for such structures.