CFRP层板冲击损伤空耦超声Lamb波特征成像——基于时间反转损伤指数
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摘要
为实现飞机碳纤维复合材料(Carbon Fiber Reinforced Plastics,CFRP)层板在役检测,采用同侧空气耦合超声兰姆波特征成像检测的方法对其缺陷进行检测。将非接触空气耦合超声传感器置于CFRP层板同侧,激发A0模态兰姆波,对其冲击损伤进行D扫描检测。引入时间反转损伤指数表征复合材料层板的冲击损伤。结合概率损伤算法,以该指数作为损伤重构成像的特征值,将不同扫描路径上的特征值数据进行融合,得到CFRP层板冲击损伤缺陷的兰姆波图像。结果表明,基于时间反转的兰姆波图像不仅能够直观地呈现损伤缺陷的位置和形状,而且能够通过避免基准信号选取和减少扫描步进次数显著提高检测效率。
In order to realize the in-service inspection of aircraft carbon fiber reinforced plastics( CFRP) plates,the same side air-coupled ultrasonic lamb wave feature imaging detection method was used to detect the defects,The D-scan of the A0 mode Lamb waves,which were generated by noncontact air-coupled ultrasonic transducers on the same side of plates,was used to test the impact damage defects. Then,the time reversal damage index was introduced to characterize the impact damage of the CFRP plates. Combining with the probability damage imaging algorithm,the DI data of different scanning paths were regarded as feature values of reconstructed image. The lamb wave image which could display the size and location of the impact damage was acquired by the imaging fusion. The results showed that the lamb wave image based on time reversal can not only represent the position and size of the damage defect,but also can significantly improve the test efficiency by avoiding the selection of the reference signal and reducing the number of scaning steps.
In order to realize the in-service inspection of aircraft carbon fiber reinforced plastics( CFRP) plates,the same side air-coupled ultrasonic lamb wave feature imaging detection method was used to detect the defects,The D-scan of the A0 mode Lamb waves,which were generated by noncontact air-coupled ultrasonic transducers on the same side of plates,was used to test the impact damage defects. Then,the time reversal damage index was introduced to characterize the impact damage of the CFRP plates. Combining with the probability damage imaging algorithm,the DI data of different scanning paths were regarded as feature values of reconstructed image. The lamb wave image which could display the size and location of the impact damage was acquired by the imaging fusion. The results showed that the lamb wave image based on time reversal can not only represent the position and size of the damage defect,but also can significantly improve the test efficiency by avoiding the selection of the reference signal and reducing the number of scaning steps.
引文
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[19]刘增华,徐营赞,何存富,等.板状结构中基于Lamb波单模态的缺陷成像试验研究[J].工程力学,2014,31(4):232-238
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[3]何为,关志东,王进.带表面防护层复合材料层板的低速冲击及冲击后压缩性能试验研究[J].复合材料学报,2014,31(2):485-494.
[4]刘松平,刘菲菲,史俊伟,等.复合材料冲击损伤高分辨率超声成像检测与损伤行为分析[J].机械工程学报,2013,49(22):16-23.
[5]Chen Y,Luo Z B,Zhou Q,et al.Modeling of ultrasonic propagation in heavy-walled centrifugally cast austenitic stainless steel based on EBSD analysis[J].Ultrasonics,2015,59:31-39.
[6]刘增华,樊军伟,何存富,等.基于概率损伤算法的复合材料板空气耦合Lamb波扫描成像[J].复合材料学报,2015,32(1):227-235.
[7]危荃,金翠娥,周建平,等.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[J].无损检测,2016,38(8):6-11.
[8]常俊杰,卢超,小仓幸夫.非接触空气耦合超声检测原理及应用研究[J].无损探伤,2013,37(4):6-11.
[9]Durvasula V S S,Madhavan V,Janardhan P M,et al.Visualization studies of Lamb wave propagation and interactions with anomalies in composite laminates using air-coupled ultrasonics[C].Proceedings of the American Institute of Physics Conference Series,F,2014.
[10]Fan Z C,Jiang W T,Cai M L,et al.The effects of air gap reflections during air-coupled leaky Lamb wave inspection of thin plates[J].Ultrasonics,2016,65:282-295.
[11]Ramadas C,Padiyar J,Balasubramaniam K,et al.Lamb wave based ultrasonic imaging of interface delamination in a composite T-joint[J].NDT&E International,2011,44(6):523-530.
[12]刘增华,颉小东,吴斌,等.基于连续小波变换的厚壁管道周向导波扫描成像试验研究[J].机械工程学报,2013,49(2):14-19.
[13]Zhou C,Su Z,Cheng L.Probability-based diagnostic imaging using hybrid features extracted from ultrasonic Lamb wave signals[J].Smart Materials&Structures,2011,20(20):125005.
[14]饶璐雅,陈果,卢超,等.碳纤维复合材料层板冲击损伤的空气耦合兰姆波成像检测[J].宇航材料工艺,2017,47(5):69-74.
[15]Liu Z,Yu H,Fan J,et al.Baseline-free delamination inspection in composite plates by synthesizing non-contact aircoupled Lamb wave scan method and virtual time reversal algorithm[J].Smart Material Structures,2015,24(4):045014.
[16]赵乃志,陈桂凤.基于超声导波时间反转理论的板结构健康监测[J].仪器仪表与分析监测,2016(1):24-27.
[17]Xu B,Giurgiutiu V.Single mode tuning effects on Lamb wave time reversal with Piezoelectric wafer active sensors for structural health monitoring[J].Journal of Nondestructive Evaluation,2007,26(2-4):123-134.
[18]Caccese V,Mewer R,Vel S S.Detection of bolt load loss in hybrid composite/metal bolted connections[J].Engineering Structures,2004,26(7):895-906.
[19]刘增华,徐营赞,何存富,等.板状结构中基于Lamb波单模态的缺陷成像试验研究[J].工程力学,2014,31(4):232-238