高ra值是张裂纹形成产生的波，低值是剪切裂纹形成的波。
High ra value is wave generated by tensile cracks and low ra value is wave generated by shear cracks propagation.
当间距减小到一定值时产生剪切裂纹并不断扩展，最终导致断裂破坏。
When the shear band spacing reaches the critical value, shear cracks occur and continuously extend, finally resulting in the fracture failure.
根据损伤变量的变化，采用单元消除法分析了剪切裂纹的扩展，并得到了剪切各个段的金属流动、应力应变以及损伤变量分布。
Crack growth was analyzed by using element eliminating method based on the variation of damage variable. Material flow, strain, stress and damage distribution of different steps was achieved.
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