服役环境下材料蠕变对挤压筒过盈量的影响

在传统Lamé公式的基础上引入直接位移求解法（DDM），推导了考虑蠕变效应的挤压筒应力/应变分布解析模型，分析了各层筒应力随时间的变化情况。针对挤压筒用热作模具钢H13进行了高温蠕变试验，获取了500 ℃下热作模具钢H13的蠕变行为和Norton表达式，探讨了材料蠕变对挤压筒各层之间过盈量的影响规律。研究结果表明，交界面处各层筒的蠕变应变有差别，造成径向变形不一，从而使得过盈量减小。

Creep Effects on Interferences of Extrusion Container with Consideration of Working Conditions

An analytical method, also called direction displacement method (DDM), was proposed based on the Lamé equation to predict the stress/strain evolution in extrusion container. Then, the experiments for evaluating the creep effects of H13 steel at the temperature of 500℃ were conducted, and the creep behavior was modelled by using Norton's law. Finally, a case study was investigated to analyze the relationship between material creep effects and interferences. It is found that the creep strain of each layer in the interface is different, caused the radial deformation is different, thus the interferences are reduced.