Fast Prediction for Dynamic Response of Cellular Material under Dynamic Crushing

Abstract

In this study, a dynamic enhancement stress model for cellular materials was derived from kinematics perspective, which directly reflected the influence of inertia effect on dynamic stress. Based on the proposed dynamic enhancement stress model, a densification strain calibration (DSC) analytical model with wider applicability for cellular materials was established, in which stress-dependent densification strain was employed. FE simulations for linear hardening and power hardening material under dynamic impact were conducted to validate DSC model. Comparing with idealized model (rigid, perfectly-plastic, locking model), dynamic plateau stress obtained by using of DSC model matched better with numerical results. Moreover, experimental results in published literature were employed to further confirm the reliability of DSC model in predicting projectile deceleration and final crushing depth. Finally, DSC model was used to predict dynamic response of gradient PVC foam, and the relative errors of final crushing depth to numerical results was within 8%.