Crack propagation is affected by many factors, among which, the crack tip plastic zone attracts a lot of attention.

影响裂纹扩展的因素有许多，这其中，裂纹尖端塑性区引起众多研究者的兴趣。

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In this model, the plastic zone induced by the overload is affected by the three-dimensional constraints, and it leads to significant influence on the crack closure and growth rate.

在此模型中，裂尖的三维约束状态显著影响超载塑性区，从而显著影响裂纹的闭合和扩展速率。

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Central crack for the welded plate was located in the fusion zone between welding seam and heat-affected zone.

焊接板的中心裂纹处于焊缝与热影响区之间的熔合区。

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