蜂窝结构复合材料的空气耦合Lamb波检测技术

AIR COUPLED LAMB WAVE DETECTION TECHNOLOGY FOR HONEYCOMB COMPOSITES

纸质蜂窝结构应避免液体浸入,针对不能使用液体耦合剂对该种材料进行检测的问题,本文在使用空气耦合穿透式C扫成像对蜂窝结构材料进行检测的基础上,提出了使用空气耦合Lamb波对上蒙皮与蜂窝结构间的脱粘缺陷进行检测的方法。建立仿真模型对蜂窝结构中的脱粘缺陷进行检测和超声波传播过程可视化,研究了Lamb波A0模态与工件结构的相互作用,分析了脱粘大小对声波传播的影响。结果表明,应用空气耦合超声导波技术可以较好地实现其脱粘类缺陷的检测,可应用于实际在役检测。

Paper honeycomb structure should avoid liquid immersion.Aiming at solving the problem that liquid coupling agent can′t be used to detect this kind of material,based on the use of air-coupled penetrating C-scan imaging to detect honeycomb structure material,a method of using air-coupled Lamb wave to detect the debonding defect between skin and honeycomb structure was proposed.A simulation model was established to detect debonding defects in honeycomb structures and visualize the ultrasonic propagation process.The interaction between Lamb wave A0 mode and workpiece structure was studied,and the influence of debonding size on acoustic propagation was analyzed.The results show that the application of air-coupled ultrasonic guided wave technology can better achieve the detection of debonding defects,and can be applied to actual in-service detection.