Prediction model of fatigue life of Ni-based single crystal superalloy
specimen with single hole based on the EIFS
- xiangzhen xue,
- wenxian li,
- Zhixun Wen
Abstract
A method of predicting the fatigue life under multi-axial loads based on
the Paris law and EIFS was proposed. The crack shape factor of Ni-based
single crystal superalloy material with single hole was calculated.
Meanwhile, the Miss stress, Max principal strain and Magnitude
displacement of the specimen along the dangerous path under different
load stresses, initial crack and stress ratio were investigated by
Abacus. The fatigue life situation of Ni-based single crystal superalloy
material with single hole has different working conditions, which were
predicted and validated by test eventually. The results show that the
crack propagates at a faster speed under large load stresses, leading to
a lower fatigue life. The larger initial crack length results in faster
the crack growth on the specimen, and the shorter its fatigue life is.
For the different stress ratios, smaller stress ratio can lead to lower
fatigue life. Meanwhile, the fatigue life of Ni-based single crystal
superalloy material with single hole predicted by the presented method
herein based on the Paris law and EIFS agrees well with the fatigue test
results.