The variation of the shape of cracks with the crack length was investigated.
测量了表面裂纹形状随裂纹长度的变化规律。
The single lap joint fails when the crack length reaches to the critical size.
当裂纹扩展到临界尺寸时，接头会迅速破坏。
The diagnosis and identification of the crack length for the disk parts is attached importance to.
所以圆盘类零件裂纹长度的诊断识别问题越来越受到重视。
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