塑性 变形 塑性材料(Ductile Materials)：δ >5%，如：碳钢、黄铜、铝合金 脆性材料(Brittle Materials )：δ< 5%，如：灰铸铁、玻璃、陶瓷 伸长率 断面收缩率 4．局部变...
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However, in case of ductile materials they cause poor surface finish and low tool life.
可是在塑性材料加工时，造成表面光洁度和刀具寿命低。
Due to work hardening in the groove area, ductile materials and tempers should be specified.
由于需要对凹槽进行硬化，所以需要指定塑性材料和回火。
The derived curves are convenient and applicable to ductile materials such as structural steels and mild steels.
这种应变—寿命曲线适用于结构钢和软钢等延性材料多轴疲劳下的局部应力—应变法寿命估算。
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