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On the use of absorbing layers to simulate the propagation of elastic waves in unbounded isotropic media using commercially available Finite Element packages

机译：关于使用吸收层来模拟弹性波在无边界各向同性介质中的传播，使用了市售的有限元软件包

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Finite Element models for simulating wave propagation and scattering from defects are vital for ultrasonic methods in NDE. This article addresses methods to dramatically enhance computational efficiency by only meshing a local region of the material surrounding the defect; this reduction requires some kind of boundary, or boundary condition, which absorbs, rather than reflects, any waves arriving at the exterior of the modelled domain. A variety of approaches exist and we take two approaches, Perfectly Matched Layers (PML) and Absorbing Regions, selected specifically as they are readily implemented in commercially available Finite Element packages without requiring the source code. We illustrate both bulk and guided waves, and analysis is used to guide the performance, and thus to plan the use, of each of them. Finally, application examples illustrate the gains yielded by absorbing laver methods in terms of reducing both model size and unwanted reflections.
机译：模拟缺陷的波传播和散射的有限元模型对于NDE中的超声方法至关重要。本文讨论了仅通过网格化缺陷周围材料的局部区域来显着提高计算效率的方法。这种减少需要某种边界或边界条件，该边界或边界条件吸收而不是反射到达建模域外部的任何波。存在多种方法，我们采用两种方法，完全匹配层（PML）和吸收区域，它们是专门选择的，因为它们很容易在市售的有限元程序包中实现而无需源代码。我们将说明体波和导波，并使用分析来指导它们的性能，从而计划它们的使用。最后，应用示例说明了在减少模型尺寸和减少不必要的反射方面，通过吸收紫菜方法获得的收益。

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