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首页> 外文期刊>Journal of the Mechanics and Physics of Solids >Crack front waves: A 3D dynamic response to a local perturbation of tensile and shear cracks
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Crack front waves: A 3D dynamic response to a local perturbation of tensile and shear cracks

机译：裂纹前波：对拉伸和剪切裂纹的局部扰动的3D动态响应

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摘要

Crack front waves are long-lived perturbations propagating along the crack front. They are triggered by heterogeneities on the crack plane, as for instance tough asperities, which disturb the crack front shape. Crack front waves are thought to leave a trace on fracture surfaces, and are important elements for post mortem analysis. This paper presents a numerical analysis of crack front waves for tensile and shear cracks in the subsonic regime. The elastodynamics calculations are conducted with a boundary integral method. They reveal that the propagation velocity of these waves is independent of the fracture mode. Moreover, using a Lorentz transformation, we demonstrate that their speed is constant within the crack front moving frame, with a value slightly lower than the Rayleigh wave speed. Finally, we shed a new light on how, in response to the interaction with an asperity of prescribed size and toughness contrast, these waves select a localized perturbation in the velocity profile of characteristic shape, width and amplitude.
机译：裂纹前沿波是沿裂纹前沿传播的长寿命扰动。它们是由裂纹平面上的异质性触发的，例如，粗糙的凹凸不平会破坏裂纹的前端形状。裂纹前波被认为在断裂表面上留下痕迹，并且是事后分析的重要元素。本文对亚音速状态下的拉伸和剪切裂纹的裂纹前波进行了数值分析。弹性力学计算采用边界积分法进行。他们发现这些波的传播速度与断裂模式无关。此外，使用洛伦兹变换，我们证明了它们在裂纹前移动框架内的速度是恒定的，其值略低于瑞利波的速度。最后，我们阐明了如何响应具有规定大小和韧性对比的凹凸的相互作用，这些波在特征形状，宽度和振幅的速度分布图中选择局部扰动。

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