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首页> 外文会议>Proceedings of the second Asian conference on mechanics of founctional materials and structures. >RAYLEIGH SURFACE WAVES IN A FUNCTIONALLY GRADED MATERIAL (FGM) INFINITE HALF SPACE
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RAYLEIGH SURFACE WAVES IN A FUNCTIONALLY GRADED MATERIAL (FGM) INFINITE HALF SPACE

机译：功能梯度材料（FGM）无限半空间中的RAYLEIGH表面波

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摘要

To investigate the propagation behavior of Rayleigh surface waves along the surface of a functionally graded material (FGM) half space, both coordinate transformation method and power series technique are employed for the asymptotic analytical derivations. By considering three basic FGM graded variation models, the propagation properties, including dispersion relations, mode analysis, attenuation tendency along depth, and characters of particles displacements trajectory are discussed. Results obtained indicate that coupled Rayleigh waves can propagate at the surface of an FGM half space, their dispersion relations, attenuation tendency and the direction of particles displacements motion at the free surface are dependent upon the graded variation tendency of the material parameters; there is not only one mode when the material bulk shear wave velocity increase along depth direction. These results may provide theoretical guidance for nondestructive evaluation (NDT) of FGM in engineering applications as well as the explanation of some seismic wave propagation phenomenon.
机译：为了研究瑞利面波在功能梯度材料（FGM）半空间表面上的传播行为，采用了坐标变换方法和幂级数技术进行渐近分析。通过考虑三种基本的FGM梯度变化模型，讨论了传播特性，包括色散关系，模式分析，沿深度的衰减趋势以及粒子位移轨迹的特征。所得结果表明，耦合瑞利波可以在FGM半空间的表面传播，其色散关系，衰减趋势和自由表面粒子位移运动的方向取决于材料参数的梯度变化趋势。当材料的整体剪切波速度沿深度方向增加时，不仅存在一种模式。这些结果可为工程应用中的FGM无损评估（NDT）提供理论指导，并为某些地震波传播现象的解释提供依据。

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