Experimental Evaluation of Characteristics of Second-Harmonic Generation in Statically Loaded CFRP Composites

Abstract

The nonlinear acoustic parameter of cross-ply CFRP subjected to a tensile strain was experimentally evaluated. We specially concentrated on second-harmonic generation from a monochromatic wave to evaluate the nonlinear parameter of CFRP composites. On the first experiment, the nonlinear parameter increased significantly. By contrast, little increase of the nonlinear parameter of the same specimen was measured on the second experiment. The increase of the nonlinear parameter was discussed in the light of the strain history of the specimen. It has been found that irreversible damage increases the nonlinear acoustic parameter of the CFRP composites.