第二种是平面平行剪切双裂纹。
The second one is about two dimensional two parallel shear cracks.
基质层中，靠近断开的能干层处的剪切变形中纯剪切占优势，伸长方向趋向于平行剪切方向；
In the matrix, pure shear was dominative in locations where strain was inhomogeneous, and the direction of elongation tended to parallel the shear direction near the disconnected intensified layer;
但对一些由剪切引起的流动，如平面平行剪切流，线性稳定性分析的结果与实验结果相差很大。
For other flows, notably those driven by shear forces, the predictions of eigenvalue analysis fail to match experiment, for example plane parallel shear flow.
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