Dynamic Crushing Behaviors of Four Typical Auxetic Structures 2019-01-1096

The auxetic structure/material with the negative Poisson’s ratio properties can contract when compressed and expand when stretched, different from the conventional structures/materials. Due to the unique properties, it can have higher stiffness and better impact resistance with lightweight. Therefore, the auxetic structures/materials have been applied in various engineering field, such as automobile crash box, suspension mount etc. For auxetic structures/materials with negative Poisson’s ratio, there are four typical configurations (re-entrant, double arrowed, star and chiral). However, most researches have only focused on the mechanical properties on one structure. The comparison on the dynamic behaviors and crashworthiness between the four auxetic structures have not been studied. In this paper, the finite element models were developed for four typical auxetic structures. The deformation modes and energy absorption properties of auxetic structures are explored under different impact velocities. Some interesting conclusions can be obtained to guide the engineers to how to chose and utilize the four typical auxetic structures.