On the low-velocity impact responses of auxetic double arrowed honeycomb

Auxetic structures with negative Poisson's ratio have been widely studied due to their unique mechanical properties, especially the dynamic properties under low-velocity impact. In this paper, the dynamic properties of an excellent candidate for engineering application, double arrowed honeycomb (DAH), are analyzed thoroughly. The deformation patterns of the DAH under high and low velocity impact are compared, which shows there is a great difference between them. Analytical models for predicting the dynamic strength at the crushing/supporting end of DAH are developed based on cellular collapse mechanism. It shows that the crushing strength rises with the increase of the relative density and impact velocity. Numerical simulations are also performed to verify the accuracy of the analytical models. It is found that there is good agreement between the analytical and numerical predictions for the dynamic characteristics. Also, the energy absorptions of the DAH are also thoroughly studied based on the analytical models. (C) 2020 Elsevier Masson SAS. All rights reserved.