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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >ON THE RELATIONSHIP BETWEEN ULTRASONIC AND MICRO-STRUCTURAL PROPERTIES OF IMPERFECT INTERFACES IN LAYERED SOLIDS
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ON THE RELATIONSHIP BETWEEN ULTRASONIC AND MICRO-STRUCTURAL PROPERTIES OF IMPERFECT INTERFACES IN LAYERED SOLIDS

机译：层状固体中缺陷界面的超声与微观结构性质的关系研究

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摘要

The main conclusion of this investigation is that the elastic response of a double imperfect interface formed by rough surfaces in contact can be described by a single pair of stiffness constants whose values are independent of the angle of incidence of the interrogating wave. This conclusion could not have been assumed to be true a priori. In fact, the macroscopic elastic response of the interface is determined by the scattering properties of the interfacial defects, and the scattering cross-section of the latter depends on the angle of incidence. Therefore, the possibility that the interface as a whole would have macroscopic properties dependent on the direction of incidence of the interrogating wave could not be excluded prior to this investigation. Finally, the micromechanical models used in this work to predict the dependence of the interfacial stiffness constants on the applied normal pressure have been shown to provide a sufficiently accurate description of the elastic behavior of the system. However, as discussed by Brown and Scholz, since several model parameters are grouped in clusters, the determination of their values based on macroscopic measurements is affected by a certain degree of uncertainty. Furthermore, upon the occurrence of plastic deformation at the contacts between the surfaces the models have been shown not to predict the values of the interfacial stiffness constants correctly. Additional work is therefore required to extend the validity of these micromechanical models.
机译：这项研究的主要结论是，由接触的粗糙表面形成的双重缺陷界面的弹性响应可以用一对刚度常数来描述，其值与询问波的入射角无关。不能假定此结论是先验的。实际上，界面的宏观弹性响应是由界面缺陷的散射特性决定的，界面缺陷的散射截面取决于入射角。因此，在该研究之前，不能排除界面整体上具有取决于探询波的入射方向的宏观特性的可能性。最后，已经显示出用于预测界面刚度常数对所施加的法向压力的依赖性的微力学模型可以提供对系统弹性行为的足够准确的描述。但是，正如Brown和Scholz所讨论的那样，由于几个模型参数是按群集分组的，因此基于宏观测量值确定其值受一定程度的不确定性影响。此外，在表面之间的接触处发生塑性变形时，已经表明模型不能正确预测界面刚度常数的值。因此，需要额外的工作来扩展这些微机械模型的有效性。

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