Abstract
Ultrasonic testing is applied to evaluate cure degree of resin in GFRP laminates. Polymer based composites are widely used to repair aged structures in civil engineering because of their high specific strength and good corrosion resistance. In order to prevent inappropriate repair works, nondestructive inspection of resin cure after construction is required. In this study, GFRP laminates with cure distribution in the thickness direction is evaluated using ultrasonic waves, which is compared with surface hardness. It is found that frequency characteristics are more reliable as cure index.
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