Experimental and numerical investigation on the response of stiffened panels subjected to lateral impact considering material failure criteria

摘要

A series of experiments have been conducted to investigate the dynamic response of stiffened panels. The uniaxial tension experiments and the dynamic experiments were conducted to obtain the material characterization. The falling weight experiments were conducted to study the dynamic response of the stiffened panels. A dynamic BWH criterion which combines the BWH criterion and the Cowper-Symonds model is proposed to evaluate the material failure. The scaled constant strain (CS) criterion can decrease the influence of mesh size and improve the accuracy of the simulations. These two different criteria are applied in the simulation models and the simulation results are compared with the experiments. The simulations of the experiments are carried out using the explicit solver of the finite element software package Abaqus. The dynamic BWH criterion is implemented in the numerical simulation using user material subroutine (VUMAT). The simulation results show that the dynamic BWH criterion is better consistent with the experimental results than the scaled CS criterion. Because the influence of stress state and strain rate on material failure has been considered in the dynamic BWH criterion. The formation mechanism of different fracture shapes of the stiffened panels is discussed.