Zhao Liang, Zhou Jun, Yuan Weifeng, Gu Bin, Deng Mingxi, Xu Caibin, Ding Xiangyan, Qi Zhengpan, Wang Jishuo, Ying Qin
Key Laboratory of Testing Technology for Manufacturing Process MOE, Southwest University of Science and Technology, Mianyang 621010, China.
Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Southwest University of Science and Technology, Mianyang 621010, China.
Sensors (Basel). 2025 Jan 2;25(1):222. doi: 10.3390/s25010222.
The directivity of the quasi-static component (QSC) is quantitatively investigated for evaluating the orientation of a micro-crack buried in a thin solid plate using the numerical simulation method. Based on the bilinear stress-strain constitutive model, a three-dimensional (3D) finite element model (FEM) is built for investigating the nonlinear interaction between primary Lamb waves and the micro-crack. When the primary Lamb waves at A0 mode impinge on the micro-crack, under the modulation of the contact acoustic nonlinearity (CAN), the micro-crack itself will induce QSC. The amplitude of the QSC generated can be used for directly charactering the micro-crack orientation. The finite element simulation results show that the directivity of the QSC radiated by the micro-crack is closely related to the orientation of the micro-crack, allowing for the characterization of micro-crack orientation without the need for baseline signals. The results indicate that the directionality of the QSC can be used for characterizing the orientation of the micro-crack. The amplitude of the QSC is affected by the contact area between two surfaces of the micro-crack. It is demonstrated that the proposed method is a feasible means for the characterization of micro-crack orientation.
利用数值模拟方法对准静态分量（QSC）的方向性进行了定量研究，以评估埋于薄固体板中的微裂纹的取向。基于双线性应力-应变本构模型，建立了三维（3D）有限元模型（FEM），用于研究一次兰姆波与微裂纹之间的非线性相互作用。当A0模式的一次兰姆波撞击微裂纹时，在接触声学非线性（CAN）的调制下，微裂纹本身会产生QSC。所产生的QSC的幅度可用于直接表征微裂纹的取向。有限元模拟结果表明，微裂纹辐射的QSC的方向性与微裂纹的取向密切相关，无需基线信号即可表征微裂纹的取向。结果表明，QSC的方向性可用于表征微裂纹的取向。QSC的幅度受微裂纹两个表面之间接触面积的影响。结果表明，所提出的方法是表征微裂纹取向的一种可行手段。
