Static and Dynamic Mechanical Properties of 3D Auxetic Hierarchical Honeycombs

The auxetic structure, characterized by its unique deformation mode, has garnered significant attention in the field of protective materials. However, practical applications have revealed limitations, including low platform stress and insufficient energy absorption capacity. To address these shortcomings and enhance the energy absorption performance of the auxetic structure, this study employs a hierarchical strategy inspired by the “spider web” topology, utilizing a three-dimensional reentrant honeycomb design. Quasi-static compression tests and finite element impact simulations are conducted to evaluate the performance of the newly developed three-dimensional hierarchical structure with a negative Poisson’s ratio. The results demonstrate that the hierarchical design notably influences the mechanical properties and deformation modes of the auxetic structures.