Wang Jishuo, Xu Caibin, Hu Ning, Deng Mingxi
College of Aerospace Engineering, Chongqing University, Chongqing, China.
School of Mechanical Engineering, Hebei University of Technology, Tianjin, China
JASA Express Lett. 2022 Feb;2(2):024001. doi: 10.1121/10.0009384.
A microcrack localization method based on a static component (SC) induced by a primary A0 Lamb wave is proposed. Based on the bilinear stress-strain constitutive model, a two-dimensional finite element model is built to investigate the interaction between microcracks and Lamb waves. The A0 Lamb wave at low frequency is selected to be the primary Lamb wave, which is beneficial to microcracks localization. Based on the time of flight of the generated SC pulse, an indicator named normalized amplitude index is defined for finding the location and number of microcracks. Simulation results show that one or multiple microcracks can be effectively located.
提出了一种基于由一次A0兰姆波诱导产生的静态分量（SC）的微裂纹定位方法。基于双线性应力-应变本构模型，建立二维有限元模型来研究微裂纹与兰姆波之间的相互作用。选择低频A0兰姆波作为一次兰姆波，这有利于微裂纹定位。基于所产生的SC脉冲的飞行时间，定义了一个名为归一化幅度指数的指标来确定微裂纹的位置和数量。仿真结果表明，可以有效地定位一个或多个微裂纹。
