空气耦合超声技术在航空航天复合材料无损检测中的应用

Application of Air-Coupled Ultrasonic Technology for Nondestructive Testing of Aerospace Composites

制备预埋人工缺陷的蜂窝夹芯复合材料、模压复合材料和陶瓷基复合材料试样,利用自主研制的内置专用信号处理单元的空气耦合超声无损检测系统进行试验,实现GFRP蒙皮Nomex蜂窝夹芯复合材料模拟脱粘缺陷检测、模压复合材料模拟内部分层缺陷检测以及C/SiC复合材料模拟内部分层缺陷检测。试验结果表明,空气耦合超声无损检测技术可应用于蜂窝夹芯复合材料、模压复合材料以及陶瓷基复合材料构件的非接触无损检测,在航空航天工程领域应用前景广阔。

Various kinds of composite materials with simulated defects are prepared as specimen, including the GFRP-Nomex honeycomb sandwich composites, molded composites, and ceramic matrix composites. An air- coupled ultrasonic testing system with dedicated signal processing unit is self-developed and the corresponding experiments are conducted based on the system. The nondestructive testing of the composite specimens with simulated defects are realized, including the detection of disbonding in GFRP-Nomex honeycomb sandwich composites, the testing of delamination in molded composite structures, and the detection of delamination in C/SiC composites. The results prove that the air-coupled ultrasonic testing technology is applicable for the noncontact testing of honeycomb sandwich composites, molded composites, and ceramic matrix composites. It has a wide range of applications in aerospace industry.