安装温度对热疲劳寿命的影响  

Affection of Assembly Temperature on Thermal Fatigue Life

作　　者：田方[1] 闫明[1] 陶科[1] 蒋占丽[2] 

机构地区：[1]沈阳工业大学,沈阳110178 [2]沈阳鼓风机集团有限公司,沈阳110142

出　　处：《中国机械工程》2009年第17期2119-2122,共4页China Mechanical Engineering

基　　金：辽宁省创新团队基金资助项目(2009T071)

摘　　要：考虑材料的多线性塑性随动强化性质,采用有限元方法研究了热疲劳过程的力学机理和安装温度对热疲劳寿命的影响。分析发现,适当提高试样(材料为ZL702A)的安装温度,可以控制其热应力在弹性范围内循环,从而延长试样的热疲劳寿命。安装温度的选择与材料的力学性能及零件的工作温度紧密相关,因此选择合适的安装温度需要反复计算,其方法是在保证循环中的最大压缩应力小于材料压缩屈服点的条件下,使最大拉应力最小。Mechanics mechanism of thermal fatigue and the affection of assembly temperature on thermal fatigue life were studied by using finite element method in consideration of the multilinear kinematic hardening of a material. It is discovered that an appropriate assembly temperature of specimen （material is ZL702A） can make its thermal stress cycle in elastic range, which can prolong the thermal fatigue life. The appropriate assembly temperature is related to mechanics properties of material and operating temperature, so reiterative computations are necessary to find an appropriate assembly temperature by the method that makes the maximal tensile stress smallest under conditions that the maximal compressive stress is less than the compressive yield point of material.

关 键 词：热疲劳寿命 安装温度 ZL702A 多线性随动强化 

分 类 号：TG113.25[金属学及工艺—物理冶金]