Dynamic Crushing of Gradient Auxetic Honeycombs

Abstract

As a kind of common lightweight porous materials, honeycombs have a wide range of applications in aerospace, architecture, packaging and other fields. In this paper, four types of new gradient honeycombs with negative Poisson's ratio are obtained, including angle gradient, thickness gradient and functional gradient, which are obtained by changing the geometric or physical parameters of cells. The dynamic responses of gradient auxetic honeycombs under different impact speeds are studied by ABAQUS display dynamic finite element method, and the deformation profiles of gradient honeycomb models are obtained. The nominal stress–strain curves and energy absorptions of the gradient auxetic honeycombs are studied, and the dynamic bearing capacity of the four kinds of gradient auxetic honeycombs is further analyzed. The results obtained in this paper show that the thickness of cell walls has a great influence on the impact resistance and vibration energy absorption of honeycomb structures. As for gradient honeycombs, the angle gradient honeycomb is better than the other three types in energy absorption, and the functional gradient honeycomb containing ceramic is less deformed. The research results in this paper will provide theoretical guidance for energy absorption, vibration reduction design and applications of honeycomb structures in the engineering field.