Progressive damage analysis of composite shell under impact loading

摘要

This paper investigates the impact-induced damage initiation and propagation in laminated composite shell under low-velocity impact. A three-dimensional eight-node non-conforming element with Taylor's modification scheme is described to simulate progressive damage of the composite shell. The damage analysis is performed by using Tsai-Wu quadratic failure criterion, Tsai's damage modes and an additional delamination formula at all Gauss points. The damage modes considered are matrix cracking, fiber breakage and delamination. The progressive damage is expressed by reducing stiffness of the material at all failed Gauss points. The analyses of the flat and curved laminates are compared for discussing their different damage mechanism. Numerical simulation results are validated by experiment results.