和田 明浩

Ultrasonic testing is applied to evaluate cure degree of resin in GFRP laminates. Polymer based composite materials are widely used to repair aged structures in civil engineering because they have high specific strength and good corrosion resistance. To prevent inappropriate repair works, nondestructive evaluation of resin cure after construction is required. In this study, propagation velocity of ultrasonic waves is used as cure index of resin, and through-thickness and in-plane ultrasonic measurements were conducted to compare the sensitivity to resin cure between them. It is found that evaluation of resin cure with bulk waves in the through-thickness direction is more reliable than that with guided waves in the in-plane direction.