This article presents guided-wave scattering by defects in a plate with finite width. The system comprises a homogeneous, isotropic, linearly elastic plate containing defects. The wave scattering is solved by a boundary element method (BEM) with radiation conditions for scattered guided waves. For the radiation conditions, the scattered waves are expressed by modal expansion using the semi-analytical finite-element (SAFE) dispersion analysis method. This study proposes a simple SAFE-BEM formulation based on the Galerkin projection with guided-wave mode structures accommodating beam solutions as the incident wave. The scattered waves are evaluated as far-fields in an infinite plate to consider the scattered far-fields in the framework of two-dimensional (2D) plate-wave theory.

中文翻译：

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用于有限宽度板中弹性导波散射的三维混合 SAFE-BEM

本文介绍了有限宽度板中的缺陷导致的导波散射。该系统包括含有缺陷的均质、各向同性、线弹性板。波散射通过边界元法 (BEM) 以及散射导波的辐射条件来求解。对于辐射条件，散射波使用半解析有限元（SAFE）色散分析方法通过模态展开来表达。本研究提出了一种基于伽辽金投影的简单 SAFE-BEM 公式，其导波模式结构可容纳光束解作为入射波。散射波被评估为无限平板中的远场，以在二维 (2D) 板波理论框架中考虑散射远场。