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.
出处
《机械工程材料》
CAS
CSCD
北大核心
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)
关键词
单晶合金
非对称载荷
低周疲劳
循环塑性应变能
single crystal superalloy
asymmetrical load
low cycle fatigue
cyclic plastic strain energy
