金属板疲劳损伤非线性兰姆波混频检测  

Fatigue detection in metal plate using nonlinear Lamb wave mixing method

作　　者：焦敬品[1] 李立[1] 高翔[1] 吴斌[1] 何存富[1] JIAO Jingpin;LI Li;GAO Xiang;WU Bin;HE Cunfu(Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124)

机构地区：[1]北京工业大学材料与制造学部,北京100124

出　　处：《声学学报》2022年第2期256-265,共10页Acta Acustica

基　　金：国家自然科学基金项目(11772013,11972053)资助。

摘　　要：针对金属板结构安全运行需要,开展了金属板结构疲劳损伤非线性兰姆波混频检测方法研究。通过数值仿真,研究了两列A_(0)兰姆波与材料损伤间的非线性相互作用。结果表明,两列共线A_(0)兰姆波在结构材料损伤处产生单向传播的和频S_(0)波,且和频波幅值随传播距离具有积累增长效应。对不同疲劳程度金属板试件进行了共线混频兰姆波检测实验,结果表明,和频波幅值随试件疲劳周数的增加呈单调递增趋势,提出的兰姆波混频技术可用于金属板结构疲劳程度的表征。研究工作为金属板结构疲劳损伤检测提供了可行的技术方案。Towards the safety operation of metal plate structure,a nonlinear Lamb wave mixing method was develop for fatigue detection in metal plates.The numerical simulations were conducted to investigate the nonlinear interaction between the two A_(0) Lamb waves and the material nonlinearity.The results show that two collinear A_(0) Lamb waves produce a sum frequency S_(0) wave which propagates in one direction at the damaged structural material,and the amplitude of the sum frequency wave exhibit a cumulative growth effect with the propagation distance.Co-linear Lamb wave mixing experiments were conducted on metal plate specimens with different fatigue levels.The results showed that the amplitude of sum frequency wave showed a monotonic increasing trend with the increase of fatigue cycles of the specimen,and the proposed Lamb wave mixing technique can be used to characterize the fatigue degree of metal plates.The research provides a feasible solution for fatigue evaluation in metal plates.

关 键 词：单向传播 疲劳程度 非线性相互作用 材料损伤 兰姆波 单调递增 传播距离 混频 

分 类 号：TG115.285[金属学及工艺—物理冶金]