Low-cycle fatigue life prediction of a polycrystalline nickel-base superalloy using crystal plasticity modelling approach

被引:14
作者
GuangJian Yuan [1 ]
XianCheng Zhang [1 ]
Bo Chen [2 ]
ShanTung Tu [1 ]
ChengCheng Zhang [3 ]
机构
[1] Key Laboratory of Pressure Systems and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology
[2] The Institute for Advanced Manufacturing and Engineering, Faculty of Engineering, Environment and Computing, Coventry University
[3] AECC Commercial Aircraft Engine CoLTD, Shanghai Engineering Research Center for Commercial Aircraft Engine
关键词
Crystal plasticity; Fatigue; Finite element; Life prediction; Micro-mechanics; Nickel-base superalloy;
D O I
暂无
中图分类号
TG132.3 [特种热性质合金];
学科分类号
080502 ;
摘要
A crystal plasticity model is developed to predict the cyclic plasticity during the low-cycle fatigue of GH4169 superalloy. Accumulated plastic slip and energy dissipation as fatigue indicator parameters(FIPs) are used to predict fatigue crack initiation and the fatigue life until failure. Results show that fatigue damage is most likely to initiate at triple points and grain boundaries where severe plastic slip and energy dissipation are present. The predicted fatigue life until failure is within the scatter band of factor 2 when compared with experimental data for the total strain amplitudes ranging from 0.8% to 2.4%.Microscopically, the adjacent grain arrangements and their interactions account for the stress concentration. In addition, different sets of grain orientations with the same total grain numbers of 150 were generated using the present model. Results show that different sets have significant influence on the distribution of stresses between each individual grain at the meso-scale, although little effect is found on the macroscopic length-scale.
引用
收藏
页码:28 / 38
页数:11
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