Influence of in-plane tensile preloads on impact responses of composite laminated plates

摘要

Ballistic impact tests on composite laminated plates were carried out with a preloading device to investigate the impact responses at nominal velocities of 50 m/s and 70 m/s. Not only the center locations but also the near-edge regions of the laminated plates were impacted. Furthermore, finite element models were developed using three-dimensional solid elements and cohesive elements, and a user subroutine VUMAT of Ladeveze failure criterion was used in support of simulations in ABAQUS Explicit, providing detailed insights into the characteristics of delamination and target response. Results showed that there was a significant promotion of delamination resistance in the center location when applying appropriate preloads, but some weakening parts were also generated over large areas at the same time. A competition mechanism between the increased bending stiffness induced enhancement effect and the interlaminar stresses induced weakening effect was proposed to explain the influence of the biaxial in-plane tensile preloads on the delamination resistance of laminated plate. The work in this study may provide guidance for the impact resistance design of composite aircraft wing skin.