Numerical Simulation to Sizing Surface-Breaking Cracks by Ultrasonic Surface Wave Spectral Method
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摘要: 建立了具有吸收边界的二维平面应变有限元模型, 在研究了脉冲超声波在模型中激发和传播的基础上, 利用表面波频谱法对不同深度的表面开口裂纹深度进行了测量。通过波场快照图观察了超声波的激发以及表面波在裂纹处的散射和波型转换过程。对透射波的信号进行了处理, 得出裂纹深度和吸收频率的对应关系。Abstract: A two-dimensional plain strain finite element model was built, on the basis of investigating the ultrasonic wave exciting and propagating on the model, using Ultrasonic spectral method to sizing different depth of surface-breaking cracks. In order to show the scattering and complex mode-conversion clearly, the resuls were presented in the form of snapshots. And then, on the basis of spectral analysis to the transmission signal to obtain the relationship between slot depth and the absorption frequency.
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