非对称循环载荷下镍基单晶合金低周疲劳损伤研究  

Low-cyclic Fatigue Damage of Single Crystal Nickel-based Superalloy under the Action of Asymmetrical Load

作　　者：丁智平[1] 刘义伦[2] 尹泽勇[3] 

机构地区：[1]株洲工学院机械工程学院,湖南株洲412008 [2]中南大学机电工程学院,湖南长沙410083 [3]中国航空动力机械研究所,湖南株洲412002

出　　处：《机械工程材料》2005年第8期6-8,共3页Materials For Mechanical Engineering

基　　金：湖南省自然科学基金资助项目(02JJY5014)

摘　　要：通过分析影响单晶叶片低周疲劳寿命的主要因素,对循环塑性应变能的计算方法进行了研讨,认为构成塑性应变能的主要因素应包括循环等效应力范围、全应变范围、晶向参数和平均应力等影响参量,它们与塑性应变能之间呈幂函数关系。利用试验数据对循环塑性应变能与镍基单晶合金低周疲劳寿命之间的相关性进行定量分析,结果表明:循环塑性应变能与镍基单晶合金低周疲劳寿命之间存在着比较密切的相关关系。According to main factors of affecting low cycle fatigue （LCF） life for gas turbine blade of single crystal nickel-based superalloy, the formula and computing method of cyclic plastic strain energy were studied and discussed. The main factors of constructing cyclic plastic strain energy should include equivalent stress range, total strain range, orientation function and mean stress. The relationship between those parameters and cyclic plastic strain energy obeyed a power law. There was a close correlation between cyclic plastic strain energy and low cycle fatigue life of single crystal nickel-based superalloy.

关 键 词：单晶合金 非对称载荷 低周疲劳 循环塑性应变能 

分 类 号：V231.95[航空宇航科学与技术—航空宇航推进理论与工程] O346.2[理学—固体力学]