A crystal plasticity-based approach for creep-fatigue life prediction and damage evaluation in a nickel-based superalloy
A crystal plasticity-based approach for creep-fatigue life prediction and damage evaluation in a nickel-based superalloy
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DOI：
10.1016/j.ijfatigue.2020.106031
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发表时间：
2021-02-01
影响因子：
6
通讯作者：
Miura, Hideo
中科院分区：
文献类型：
--
作者：
Li, Kai-Shang;Wang, Run-Zi;Miura, Hideo
采用晶体塑性有限元法（CPFE）对蠕变-疲劳裂纹萌生寿命进行了预测。基于CPFE的模型可以描述宏观循环变形，揭示颗粒级损伤机制。通过引入疲劳和蠕变指标参数，建立了一种新的寿命预测方法。此外，GH4169高温合金在650 ℃下的一系列应变控制蠕变疲劳试验被用来验证该模型的预测精度，其中大部分数据点位于+/- 1.5误差带内。最后，提出了一种具有工程应用价值的蠕变-疲劳损伤叠加准则，为蠕变-疲劳寿命的保守估算提供了一种可能的方法。
A numerical process based on crystal plasticity finite element (CPFE) was implemented to predict creep-fatigue crack initiation life. CPFE-based model can describe the macroscopic cyclic deformation and reveal grain-level damage mechanism. A new life prediction approach was then constructed by introducing fatigue and creep indicator parameters. Furthermore, a series of strain-controlled creep-fatigue tests in GH4169 superalloy at 650 degrees C were used to validate predicted accuracy of this model, where most of the data points lied within +/- 1.5 error band. Finally, a potential methodology for conservative creep-fatigue life evaluation was provided by flexible creep-fatigue damage summation rule in engineering applications.