In-plane impact dynamics of angular gradient honeycomb structure with adjustable Poisson’s ratio multi-arc concave cell

The honeycomb structure with negative Poisson's ratio has many advantages. The development of lightweight and high-strength materials requires researchers to construct new negative Poisson's ratio honeycomb structures from the gradient structure design method. In this paper, a new angular gradient multi-arc concave honeycomb structure has been constructed based on a multi-arc concave cell. By setting different cell arrangement modes, four angular gradient honeycomb structures were established: positive gradient, negative gradient, symmetrical positive gradient and symmetrical negative gradient. The relative density expression of the angular gradient multi-arc concave honeycomb structure was deduced. The deformation failure modes, Von Mises stress contours, dynamic response curves, energy absorption per unit mass and plateau stress of the different gradient arrangement and impact velocity were numerically studied. The results show that the gradient arrangement and the impact compression velocity have significant effects on the deformation failure modes and the dynamic response curve of the honeycomb structures. The energy absorption effect of the negative gradient honeycomb structure is the best. The plateau stress of the honeycomb structure is mainly affected by the impact compression velocity, while the gradient arrangement has little effect on the plateau stress.