Micro-crack detection of nonlinear Lamb wave propagation in three-dimensional plates with mixed-frequency excitation

作     者：Wei-Guang Zhu Yi-Feng Li Li-Qiang Guan Xi-Li Wan Hui-Yang Yu Xiao-Zhou Liu 祝伟光;李义丰;关立强;万夕里;余辉洋;刘晓宙

作者机构：College of Computer Science and TechnologyNanjing Tech UniversityNanjing 211800China Key Laboratory of Modern AcousticsMinistry of EducationNanjing UniversityNanjing 210093China Key Laboratory of Modern AcousticsMinistry of EducationInstitute of Acoustics and School of PhysicsNanjing UniversityNanjing 210093China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2020年第29卷第1期

页      面：336-345页

核心收录：

学科分类：07[理学] 082403[工学-水声工程] 08[工学] 070206[理学-声学] 0824[工学-船舶与海洋工程] 080102[工学-固体力学] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.61571222,61602235,and 11474160) the Six Talent Peaks Project of Jiangsu Province,China 

主　　题：nonlinear Lamb wave mixed-frequency micro-cracks amplitude ratio 

摘      要：We propose a nonlinear ultrasonic technique by using the mixed-frequency signals excited Lamb waves to conduct micro-crack detection in thin plate *** models of three-dimensional(3D)aluminum plates and composite laminates are established by ABAQUS software,where the aluminum plate contains buried crack and composite laminates comprises cohesive element whose thickness is zero to simulate delamination *** interactions between the S0 mode Lamb wave and the buried micro-cracks of various dimensions are simulated by using the finite element *** frequency spectrum analysis is applied to the received time domain signal and fundamental frequency amplitudes,and sum and difference frequencies are extracted and *** results indicate that nonlinear Lamb waves have different sensitivities to various crack *** is a positive correlation among crack length,height,and sum and difference frequency amplitudes for an aluminum plate,with both amplitudes decreasing as crack thickness increased,i.e.,nonlinear effect weakens as the micro-crack becomes *** amplitudes of sum and difference frequency are positively correlated with the length and width of the zero-thickness cohesive element in the composite ***,amplitude ratio change is investigated and it can be used as an effective tool to detect inner defects in thin 3D plates.