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The dynamics stress intensity factor of surface and internal crack subjected to obliquely shear waves

机译：斜向剪切波作用下表面和内部裂纹的动力应力强度因子

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By using the dislocation model for the surface crack and images for the free surface, an analytical solution for interaction between a screw dislocation near a mode III surface crack subjected to the dynamic antiplane stress has been derived. The change of the crack extension force as the surface crack propagation towards the dislocation is presented in this paper. Without the applied stress, the dislocation stress field tends to drag the surface crack to the dislocation where the strain energy can be relaxed. Under the periodic dynamic stress, the surface crack can be repelled by the dislocation depending upon the direction of the applied stress and wave number and the Burgers vector of the dislocation. The effects of the wave number, the input incident angle and the dislocation on the stress intensity factor are also presented. The results showed this problem can be reduced to a crack embedded in an infinite solid when the distance between the dislocation and the free surface is => 20. This method is applied to find out the dynamic stress intensity factor of an internal crack near a free surface under SH loadings.
机译：通过使用表面裂纹的位错模型和自由表面的图像，得出了在III型表面裂纹附近承受动态反平面应力的螺钉位错之间相互作用的解析解。提出了随着表面裂纹向位错的扩展，裂纹扩展力的变化。在没有施加应力的情况下，位错应力场趋向于将表面裂纹拖至位错处，从而可以放松应变能。在周期性的动态应力下，表面裂纹可以被位错排斥，这取决于施加应力的方向和波数以及位错的Burgers矢量。还给出了波数，输入入射角和位错对应力强度因子的影响。结果表明，当位错与自由表面之间的距离为=> 20时，该问题可以简化为嵌入无限实体中的裂纹。该方法用于找出自由附近内部裂纹的动应力强度因子。 SH载荷作用下的表面。

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