Impact induced dynamic deformations and stresses in CFRP composite laminates

An analysis is presented of the dynamic response and stresses in a flexible carbon fibre composite strip that is struck by a rigid missile. The relative approach between the colliding missile and the strip was obtained in a stepwise fashion in the time domain by considering the compatibility of forces and displacements at the interface. The stresses in the region of contact were calculated using Hertz contact theory modified to represent material anisotropy. The plate significantly deflects near the contact patch during the period of contact. This deflection reduces the normal contact force acting between the missile and plate, and prolongs the period of contact.