Detecting impact damage-resistance change in carbon fiber/epoxy-matrix laminate by ultrasonic F-scan

Impacted carbon fiber/epoxy-matrix laminates were detected by ultrasonic F-scan, their resistance were measured before and after they had been impacted separately. The status of impacted laminates were analyzed through synthesizing impact energy, resistance change and ultrasonic F-scan graph. The results show that ultrasonic F-scan can ensure impact damage energy threshold value of carbon fiber/epoxy-matrix laminates. The resistance of laminates can be changed after they have been impacted, but there are damage in them only after they have been impacted by exceed threshold energy. So, ultrasonic F-scan can improve veracity of detecting impact damage in laminates by resistance measurement.