文献类型：期刊文献

英文题名：Nonlinear ultrasonic detection of closed cracks in metal plates with phase-velocity mismatching

作者：Sun, Di[1];Zhu, Wujun[1];Qiu, Xunlin[1];Liu, Lishuai[1];Xiang, Yanxun[1];Xuan, Fu -Zhen[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety MOE, Shanghai 200237, Peoples R China

年份：2023

卷号：135

外文期刊名：NDT & E INTERNATIONAL

收录：;EI(收录号：20230313398010);WOS:【SCI-EXPANDED(收录号:WOS:000919839800001)】；

基金：Acknowledgments This work was supported by the National Key Research and Devel-opment Program of China (2021YFC3001802) and the National NaturalScience Foundation of China (Grant Nos. 12025403, U1930202, 51835003, 12004114 and 12174102) .

语种：英文

外文关键词：Ultrasonic nonlinearity; Lamb waves; Phase-velocity mismatching; Closed crack

摘要：In this paper, nonlinear Lamb waves with phase-velocity mismatching are proposed to detect accurately closed cracks by excluding the intrinsic material nonlinearity. Simulations and experimental studies were conducted to analyze double frequency Lamb waves (DFLWs) induced by the closed cracks and the intrinsic material nonlinearity. The results show that DFLWs induced by the material nonlinearity are negligible as compared with that caused by the contact acoustic nonlinearity (CAN) of the closed cracks. The closed cracks can be accurately detected using the proposed method, and the acoustic nonlinearity parameter increases monotonically with the crack evolution. The findings of this study provide a feasible method for detection and characterization of closed cracks.