The shape is very complex, rigidity is poor. It exist serious stress concentrates, and it can cause fatiguebreakdown 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。
2
The fatiguebreakdown 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.