考虑蠕变-疲劳损伤，对部件材料进行合理的循环变形描述和准确的寿命预测，是保证航空发动机等高温设备长周期安全运行需要解决的关键问题之一。基于大型有限元软件ABAQUS，采用组合Chaboche随动强化准则和Voce各向同性硬化准则的循环弹塑性本构模型，叠加应变强化的蠕变本构模型，对GH4169合金在蠕变-疲劳载荷下伴有应力松弛的循环变形行为进行了准确的有限元模拟。同时，将Wang等最新修正的基于逐周次概念的蠕变-疲劳损伤模型进行了有限元移植，结合有限元模拟所得的循环应力、应变状态，实现了对GH4169合金蠕变-疲劳寿命的准确预测。研究结果将为进一步实现对航空发动机关键部件精确的寿命预测提供理论基础和技术手段。
Accurate life assessment and reasonable description of cyclic deformation of the material and related components considering the creep-fatigue damage of the material is an important issue for long period safety of the aero-engine under cyclic thermal-mechanical loading conditions. Based on the finite element code ABAQUS, a cyclic elasto-plastic constitutive model combining the Chaboche nonlinear kinematic hardening rule and Voce's isotropic hardening rule is firstly employed. Then with the help of an additional strain-hardening creep constitutive model, the creep-fatigue cyclic deformation behavior of the GH4169 alloy including the peak stress relaxation period is simulated accurately. Based on the simulated cyclic stress-strain state with the finite element method, accurate life prediction of the GH4169 alloy are accurately realized by numerically implementing Wang's modified creep-fatigue damage model on the basis of the cycle-by-cycle concept. Our result will provide theoretical basis and technical support for further realization of accurate prediction of the creep-fatigue life of key components of the aero-engine.
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