关键词: 兰姆波;缺陷检测;边界元法;导波与缺陷作用

Abstract:

Some implementation issues for the hybrid boundary element method program used to simulate Lamb wave interaction with defects in elastic plate were discussed, including basic elastodynamic boundary integration equation and fundamental
solutions, solving of the coefficient matrix elements for the matrix form system of linear equations, boundary conditions formulation for the virtual boundaries of the model based on mode expansion, calculation accuracy analysis, and some simulation results. This method and the acquired results provide important theoretical basis for Lamb wave plate inspection and can also be used as the foundation of defect quantification algorithm development.

Key words: Lamb wave;defect detection;boundary element method；guided wave-defect interaction