关键词: 碳纤维复合材料, 制孔结构, 超声检测, 螺旋扫查, 评价因子模型

Abstract: In order to realize the nondestructive testing and evaluation of the hole-making structure of CFRP, a portable ultrasonic C-scan tester was developed based on the principle of ultrasonic pulse reflection method, a spiral scanning method was proposed, and a mathematical model for the quality evaluation of the hole-making structures was established. By performing ultrosonic inspection tests on artificial specimens and in-service pores, based on the static distance principle, the centroid of the irregular ultrasonic C-scan image was determined. The longest axis of the centroid was extracted, and the ratio of the longest axis to the nominal diameter of the hole(RLN) was calculated to evaluate the quality of the holes. The results show that the method may greatly improve the detection speed. The measured values of stratified defect are equivalent to the actual ones. The results are consistent with the actual morphologies of in-service pores. The RLN factor may accurately evaluate various types of stratification defects.

Key words:  , carbon fiber reinforced plastics(CFRP), hole-making structure, ultrasonic detection, spiral scan, evaluation factor model