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首页> 外文期刊>Journal of Nondestructive Evaluation >Ultrasonic Attenuation in Polycrystalline Materials in 2D
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Ultrasonic Attenuation in Polycrystalline Materials in 2D

机译：2D中多晶材料中的超声衰减

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摘要

Grains in a polycrystalline material, typically a metal, act as scatterers of ultrasonic waves and thus give rise to attenuation of the waves. Grains have anisotropic stiffness properties, typically orthotropic or cubic. A new approach is proposed to calculate attenuation in a 2D setting starting from the scattering by an anisotropic circle in an isotropic surrounding. This problem has recently been solved, giving explicit, simple expressions for the elements of the transition (T) matrix (which gives the relation between the the incoming and scattered fields) when the circle is small compared to the ultrasonic wavelengths. The T matrix can be used to calculate the total scattering cross section, which in turn can be used to estimate the attenuation in the material. Explicit expressions for the attenuation coefficient for longitudinal and transverse waves are obtained for a cubic material, and contrary to results in the literature these expressions are valid also for strong anisotropy. For the longitudinal attenuation coefficient a comparison with recent FEM results for Inconel 600 gives excellent agreement.
机译：多晶材料中的晶粒，通常是金属，充当超声波的散射体，从而导致波浪的衰减。晶粒具有各向异性刚度特性，通常是正式或立方体。提出了一种新的方法来计算在各向异性周围各向异性圆的散射开始的2D设置中的衰减。最近解决了这个问题，给出了转换（T）矩阵的元素的显式，简单的表达式（在圆圈与超声波波长相比，当圆圈较小时，对转换（T）矩阵的元素（在传入的字段之间提供关系）。 T矩阵可用于计算总散射横截面，这又可以用于估计材料中的衰减。对于立方体，获得了纵向和横波的衰减系数的显式表达，并且与文献结果相反，这些表达的结果也有效地用于强四个各向异性。对于纵向衰减系数与最近的FEM结果进行比较，对于Inconel 600提供了良好的一致性。

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