Delamination and Dynamic Response Characteristics of CFRP Laminate Under Laser Shock

Laser adhesion test (LASAT) is an emerging technology that uses the reverse tensile stress of laser-induced shock waves to test composites’ curing/bonding strength. In this research, the influence of laser power density and pulse width on delamination characteristics was investigated in the context of LASAT, and the process of delamination under laser shock was revealed. The study found that the delamination position moves toward the shock surface with the increase in power density and pulse width. However, excessive power density will cause shock surface damage. For LASAT, the laser power density should be controlled in the right range to avoid unnecessary damage to the material. The delamination region caused by laser shock is elliptic, with tensile fracture in the center of the ellipse caused by the coupled tensile stress and shear fracture in the edge region caused by the action of the transverse wave and the shock deformation.