Effect of fiber architecture on the impact resistance of composite panels subjected to metallic projectile

Experiments using a single-stage gas gun were conducted to evaluate the resistance of three types of composite panels to high-velocity impacts from metallic projectiles: panels reinforced with unidirectional tape or formed from plain-woven fabric or two-dimensionally braided fabric. The critical penetration velocity, deformation, and failure morphologies were examined by virtue of high-speed photography, 3D digital image correlation technology and non-destructive testing methods. In addition, a normalized quantity was introduced to assess the energy absorption capacity of the panels. Laminates stacked by angle-ply unidirectional tapes contained impacts at higher velocities than other panels, and the energy absorption capacities of the plain-woven and braided composite panels are comparable. The results provide insights into the impact failure behavior of composite panels and can aid in the selection of materials for aeroengine casings.