The fatigue break down is the main form of die failure. To improve the use life of dies, an approach for increasing fatigue resistance of die material is reviewed.
疲劳破坏是模具失效的主要形式，为了提高模具的使用寿命，综述了提高模具材料疲劳抗力的多种途径。
The shape is very complex, rigidity is poor. It exist serious stress concentrates, and it can cause fatigue break down easily.
并且它形状复杂、刚性差，又存在严重的应力集中现象，容易产生疲劳破坏。
The shape is very complex, rigidity is poor. It exist serious stress concentrates, and it can cause fatigue break down easily.
并且它形状复杂、刚性差，又存在严重的应力集中现象，容易产生疲劳破坏。
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