文献类型：期刊文献

英文题名：Fatigue Damage Evaluation Using Nonlinear Lamb Waves with Quasi Phase-Velocity Matching at Low Frequency

作者：Zhu, Wujun[1];Xiang, Yanxun[1];Liu, Chang-jun[1];Deng, Mingxi[2];Ma, Congyun[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;[2]Chongqing Univ, Coll Aerosp Engn, Chongqing 400044, Peoples R China

年份：2018

卷号：11

期号：10

外文期刊名：MATERIALS

收录：;EI(收录号：20184205953613);WOS:【SCI-EXPANDED(收录号:WOS:000448658400134)】；

基金：This research was funded by the National Natural Science Foundation of China (11622430, 51835003 and 11834008), and the National Key Research and Development Program of China (2018YFC0808806).

语种：英文

外文关键词：ultrasonic nonlinearity; fatigue damage; lamb wave; low frequency

摘要：Due to the dispersive and multimode natures, only nonlinear Lamb waves with exact phase-velocity matching were generally used in previous studies to evaluate the evenly distributed microstructural evolution in the incipient stage of material degradation, because of the cumulative generation of second harmonics, which was also found within a significant propagation distance for mode pair S0-s0 with quasi phase-velocity matching at low frequency. To explore the feasibility of fatigue damage evaluation by using this mode pair and fully utilize its unique merits, the cumulative second harmonic analysis was performed on aluminum alloy specimens with various material damage produced by the continuous low cycle fatigue tests. Similar to mode pair S1-s2 with exact phase-velocity matching, a mountain shape curve between the normalized acoustic nonlinearity parameter and the fatigue life was also achieved with the peak point at about 0.65 fatigue life for mode pair S0-s0, even though a relatively higher sensitivity to fatigue damage was observed for mode pair S1-s2. The excited frequency selection was further analyzed in a certain frequency range, where the quasi phase-velocity matching condition was satisfied for mode pair S0-s0 owing to the less dispersive property. Results show that the fatigue damage can be effectively detected using the mode pair S0-s0, and a relatively lower excited frequency was preferred due to its higher sensitivity to microstructural evolution.