文献类型：期刊文献

英文题名：Localization of Fatigue Cracks Using Low-Frequency Nonlinear Lamb Waves in Numerical Perspective

作者：Xu, Jichao[1]; Wei, Nuoke[1]; Zhu, Wujun[1]; Xiang, Yanxun[1]; Xuan, Fuzhen[1]; Deng, Mingxi[2]

机构：[1] MOD, School of Mechanical and Power Engineering, East China University of Science and Technology, Key Laboratory of Pressure Systems and Safety, Shanghai, 200237, China; [2] College of Aerospace Engineering, Chongqing University, Chongqing, 400044, China

年份：2018

卷号：2018-October

外文期刊名：IEEE International Ultrasonics Symposium, IUS

收录：EI(收录号：20190506443688)

语种：英文

外文关键词：Structural health monitoring - Ultrasonic waves - Fatigue crack propagation - Damage detection - Finite element method - Time domain analysis

摘要：In this work, a probabilistic imaging algorithm based on ellipse method was carried out to locate a fatigue crack using nonlinear S0 mode Lamb waves, which was modeled by Three-dimensional (3D) Finite Element (FE) Simulation. A fatigue crack was modeled as a through-thickness seam, and Short-time Fourier transform (STFT) was performed on the time-domain signals from FE model to extract temporal features. A damage index (DI) was built using a probabilistic imaging algorithm (PIA) after forming an ellipse-like locus. The ultimate image result showed that the location of the fatigue crack was identified and distinguished from the hole. In a conclusion, the proposed imaging algorithm would be a feasible and effective approach to locate fatigue crack by nonlinear S0 mode Lamb waves. ? 2018 IEEE.