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首页> 外文期刊>Applied Mechanics and Engineering >DISPERSION OF WAVES IN COATED POROELASTIC CIRCULAR CYLINDERS
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DISPERSION OF WAVES IN COATED POROELASTIC CIRCULAR CYLINDERS

机译：波在多孔弹性圆柱体中的分散

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The phenomenon of crack initiation due to dynamic contact loading is referred to as fretting fatigue. This situation is commonly encountered in mechanical couplings subjected to vibration. Whenever a material has good mechanical properties but poor fretting resistance it is advantageous to provide a layer of material having good fretting resistance instead of changing the entire material. This extra layer of material can be provided by coating or by any other surface treatment methods. Wave propagation in coated poroelastic cylinders of infinite extent is investigated employing Biot's theory. The coated poroelastic cylinder consists of two poroelastic cylinders of different poroelastic materials bonded at the curved surface such that the liquids in the poroelastic materials are immiscible. Frequency equations of coated poroelastic cylinders are derived both for pervious and impervious surfaces. Let the infinite coated poroelastic cylinder be homogeneous and isotropic and the outer boundary is free from stress. At the interface of the core and coating, the stresses and displacements are continuous. For motions having infinite wavelength or when the wavenumber is zero, the axial shear and radial modes of the coated poroelastic cylinder are uncoupled each for a pervious and an impervious surface. The frequency equation of axial shear vibrations is same for pervious and impervious surfaces. Non-dimensional phase velocity for propagating modes is computed as a function of propagation constant in the absence of dissipation. The results are presented graphically for two types of coated poroelastic cylinders and then discussed.
机译：由动态接触载荷引起的裂纹萌生现象称为微动疲劳。在遭受振动的机械联轴器中通常会遇到这种情况。只要材料具有良好的机械性能但抗微动性差，则提供一层具有良好抗微动性的材料层而不是改变整个材料是有利的。该额外的材料层可以通过涂覆或通过任何其他表面处理方法来提供。利用毕奥特理论研究了无定形涂层多孔弹性圆柱体中的波传播。涂覆的多孔弹性圆柱体由两个不同的多孔弹性材料的多孔弹性圆柱体组成，这些圆柱体在曲面上结合在一起，从而使多孔弹性材料中的液体不可混溶。导出了渗透性和非渗透性表面的涂层多孔弹性圆柱体的频率方程。让无限涂覆的多孔弹性圆柱体是均质且各向同性的，并且外边界没有应力。在芯和涂层的界面处，应力和位移是连续的。对于具有无限波长的运动或当波数为零时，涂覆的多孔弹性圆柱体的轴向模和径向模在透水和不透水的表面上各自不耦合。渗透和不渗透表面的轴向剪切振动频率方程是相同的。在没有耗散的情况下，将传播模式的无量纲相速度计算为传播常数的函数。结果以图形方式显示了两种类型的带涂层多孔弹性圆柱体，然后进行了讨论。

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