文献类型：期刊文献

英文题名：A feasibility study on fatigue damage evaluation using nonlinear Lamb waves with group-velocity mismatching

作者：Zhu, Wujun[1];Xiang, Yanxun[1];Liu, Chang-Jun[1];Deng, Mingxi[2];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：90

起止页码：18

外文期刊名：ULTRASONICS

收录：;EI(收录号：20182405309590);WOS:【SCI-EXPANDED(收录号:WOS:000439742600003)】；

基金：This work was supported by National Natural Science Foundation of China (Grant Nos. 11474093, 11622430 and 11474361), National Key Research and Development Program (2016YFC0801903), and the Fundamental Research Funds for the Central Universities (Nos. 222201718005 and 222201717005).

语种：英文

外文关键词：Ultrasonic nonlinearity; Second-harmonic generation; Group velocity; Fatigue damage

摘要：The feasibility of fatigue damage evaluation has been investigated using nonlinear Lamb waves with group-velocity mismatching. To choose an efficient mode pair, a parameter is proposed to quantify the efficiency of cumulative second-harmonic generation (SHG) of Lamb waves based on the normal modal analysis. Experiments and simulations are performed to verify the proposed parameter, which demonstrates that whether the matching condition of group velocity is satisfied or not, the efficiency of cumulative SHG increases with the order of Lamb mode for the five low-order Lamb waves investigated. Then, S3-s6 mode pair with group-velocity mismatching is chosen to characterize the fatigue damage of an aluminium alloy for the high efficiency of cumulative SHG. Results show that S3-s6 mode pair is sensitive to fatigue damage evolution and the integrated amplitude of second harmonics increases by nearly 300% with fatigue cycles. Nonlinear Lamb waves with group-velocity mismatching are validated to be a candidate to efficiently evaluate the fatigue damage.