Ultrasonic Evaluation of Delamination in Quasi-Isotropic Cfrp Laminates Subjected to Low-Velocity Impact

摘要

Ultrasonic C-Scan is used very often to detect flaws and defects in the composite componetns resulted during fabrication and damages resulting from service conditions. Evaluation and characterization of defcts and damages of composites require experience and good understanding of the material as they are distinctly different in composition and behavior as compared to conventional metallic materials. The failure mechanisms in composite materials are quite complex. They involve the interaction of matrix cracking, fiber matrix interface debonding, fiber pullout, fiber fracture and delamination. Generally all of them occur making the stress and failure analysis very complex. Under low-velocity impact loading delamination is observed to be a major failure mode.