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Interaction of acoustic waves with cracks: Elastic and inelastic nonlinearity mechanisms on different time scales

机译:声波与裂纹的相互作用:不同时间尺度上的弹性和非弹性非线性机制

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摘要

The interrelated elastic and inelastic fast and slow effects of acoustic wave interaction with cracks are discussed from a unified point of view. Special attention is given to the dissipative manifestations of the presence of cracks and to the effects of the symmetrically time-reversible slow dynamics observed for acoustically activated cracks. These effects can be more pronounced than the conventionally discussed nonlinear elastic effects (such as higher harmonic generation). Taking into account the main geometric features of cracks, a thermoelastic mechanism is proposed to consistently interpret the experimental data. Consequences of the results of these studies for seismics are discussed, and the possibilities of using the observed effects for nonlinear acoustic diagnostics of cracks are discussed. (c) 2005 Pleiades Publishing, Inc.
机译:从统一的角度讨论了声波与裂纹相互作用的相互关联的弹性和非弹性快慢效应。特别注意裂纹存在的耗散表现,以及对声激活裂纹观察到的对称时间可逆慢动力学的影响。与传统讨论的非线性弹性效应(例如更高的谐波生成)相比,这些效应更为明显。考虑到裂纹的主要几何特征,提出了一种热弹性机制来一致地解释实验数据。讨论了这些研究结果对地震的影响,并讨论了将观察到的效应用于裂缝的非线性声学诊断的可能性。 (c)2005年Pleiades Publishing,Inc.

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