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首页> 外文期刊>Journal of Nondestructive Evaluation >Ultrasonic Wave Scattering from Rough, Imperfect Interfaces. Part I. Stochastic Interface Models
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Ultrasonic Wave Scattering from Rough, Imperfect Interfaces. Part I. Stochastic Interface Models

机译：界面粗糙，不完美的超声波散射。第一部分：随机接口模型

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摘要

A theoretical model for ultrasonic wave scattering by geometrically irregular and imperfectly bonded interfaces is presented. In Part I, the normal stiffness of interfaces formed by the partial contact of solids with rough surfaces is estimated for two models of contacting surfaces with random roughness in one dimension only. The first model considers nonconforming surfaces with a single-scale of rougluiess, while double-scale roughness characterizes the surfaces of the second model, which are conforming at the large scale and nonconforming at the smaller scale. The surfaces' profiles are described by Gaussian probability and spectral densities. The surfaces at each contact are modeled by two cylinders under a compressive load and the normal stiffness per unit area of the interface is evaluated by averaging the stiffness of all the contacts, assuming they do not interact with each other. It is shown that the smaller the roughness, the softer the interface; the larger the autocorrelation length, the softer the interface; and the smaller the initial aperture, the stiffer the interface. Furthermore, interfaces described by the second model appear much stiffer than those described by the first model. The interface characterizations and normal stiffness models developed in Part I will be used in Part II to study the scattering of ultrasonic plane waves by such an interface.
机译：提出了通过几何不规则和不完美结合的界面进行超声波散射的理论模型。在第一部分中，仅针对在一维中具有随机粗糙度的接触表面的两个模型，估计了由固体与粗糙表面的部分接触形成的界面的法向刚度。第一个模型考虑了具有单尺度粗糙集的不合格表面，而第二个模型的表面则以双尺度粗糙度为特征，第二个模型的表面在较大规模上是合格的，而在较小规模上是不合格的。表面轮廓由高斯概率和光谱密度描述。每个接触点的表面都由两个圆柱体在压缩载荷下建模，并且假设所有接触点之间不相互作用，则通过平均所有接触点的刚度来评估界面每单位面积的法向刚度。结果表明，粗糙度越小，界面越软。自相关长度越大，界面越软;初始孔径越小，界面越硬。此外，第二种模型描述的界面看起来比第一种模型描述的界面要硬得多。在第一部分中开发的界面特征和法向刚度模型将在第二部分中用于研究这种界面对超声波平面波的散射。

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