扁挤压筒优化设计及疲劳蠕变分析

摘要

Under the severe working conditions of high temperature,high pressure and high friction,the stress distribution of flat container is very uneven and easy to crack.The structural optimum design of equivalent wall thickness by punching is investigated.The results of ANSYS finite element software show that the stress of the dangerous parts can be decreased by 12.1 ％ compared with the traditional flat container.Then using the ANSYS finite element software,the fatigue life of new structure is analyzed,the cumulative coefficients is 0.973 24 ＜1,that is to say,the new structure of flat container meets the requirements of fatigue strength.%针对扁挤压筒在周期性的高温、高压、高摩擦的严酷工况下工作,因几何形状的不完全对称造成应力分布极不均匀,容易开裂的问题,提出一种在扁挤压筒内衬上开通孔等效等壁厚的方式来减弱应力集中现象.由ANSYS有限元软件分析得出,与传统的扁筒设计结构相比,可使危险部位的工作应力降低12.1％.对优化后的扁挤压筒进行疲劳分析后可知,扁挤压筒累积使用系数为0.973 24＜1,故优化设计后的扁挤压筒满足疲劳强度的要求.