GH4169合金高温多轴低周疲劳寿命预测  

FATIGUE LIFE PREDICTION FOR GH4169 SUPERALLOY UNDER MULTI-AXIAL CYCLIC LOADING AT 650 ℃

作　　者：王建国[1] 王红缨[1] 王连庆[1] 康永林[1] 尚德广[2] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]北京工业大学机电学院,北京100022

出　　处：《机械强度》2008年第2期324-328,共5页Journal of Mechanical Strength

基　　金：国家自然科学基金资助项目(10172010)~~

摘　　要：基于临界面模型的方法提出一个新的多轴低周疲劳损伤准则。该准则与目前的临界面法不同的是,在预测多轴低周疲劳寿命的模型中,同时考虑临界面上最大剪应变和正应变在不同加载路径下对多轴低周疲劳损伤的贡献。试验结果表明,文中提出的多轴低周疲劳寿命预测模型,对于GH4169合金高温多轴疲劳寿命估算具有较高的准确性。The muhiaxial fatigue behavior on notched specimen of GH4169 super alloy has been studied. Full reversed axial, torsional strain controlled fatigue testes were conducted at 650 ℃ by using a MTS 809 tension-torsional servo-controlled electro-hydraulic testing machine with proportional and non-proportional loading. The phase between axial strain and torsional strain were 0° in-phase （proportional） and 45°, 90° out-of-phase （non-proportional） respectively. A new multiaxial fatigue damage criterion based on the critical approach has been proposed. The results of llfe prediction show that the new fatigue life prediction model are validated with experimental results.

关 键 词：GH4169合金 多轴低周疲劳 相位差 寿命预测 

分 类 号：V216.3[航空宇航科学与技术—航空宇航推进理论与工程] TB302.3[一般工业技术—材料科学与工程]