Imperial College London
Alternate

ProfessorFionnDunne

Faculty of Engineering, Department of Materials

Principal Research Fellow
 
 
 
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Contact

 

+44 (0)20 7594 2884fionn.dunne

 
 
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Location

 

104Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Lu:2020:10.1016/j.ijfatigue.2020.105782,
author = {Lu, X and Dunne, FPE and Xu, Y},
doi = {10.1016/j.ijfatigue.2020.105782},
journal = {International Journal of Fatigue},
title = {A crystal plasticity investigation of slip system interaction, GND density and stored energy in non-proportional fatigue in Nickel-based superalloy},
url = {http://dx.doi.org/10.1016/j.ijfatigue.2020.105782},
volume = {139},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A dislocation and gradient-based crystal plasticity finite element study of fatigue has been carried out for nickel-based superalloy RR1000 in order to investigate detrimental non-proportional effects on fatigue life. Six differing multiaxial loading cycles including both proportional and non-proportional paths have been addressed and a critical stored energy density criterion employed for fatigue life. Non-proportional paths are shown to lead to higher numbers of intragranular slip system activations, reflecting experimental observations. These give higher geometrically necessary dislocation (GND) densities resulting from slip system interaction occurring through latent hardening effects in the model. The higher GND densities in turn drive up local stress and stored energy densities, thereby leading to lower predicted fatigue lives, in keeping with non-proportional fatigue experiments in the alloy considered. Intragranular slip system interaction may be the mechanistic explanation for non-proportional effects in fatigue of engineering alloys.
AU  - Lu,X
AU  - Dunne,FPE
AU  - Xu,Y
DO  - 10.1016/j.ijfatigue.2020.105782
PY  - 2020///
SN  - 0142-1123
TI  - A crystal plasticity investigation of slip system interaction, GND density and stored energy in non-proportional fatigue in Nickel-based superalloy
T2  - International Journal of Fatigue
UR  - http://dx.doi.org/10.1016/j.ijfatigue.2020.105782
UR  - https://www.sciencedirect.com/science/article/pii/S0142112320303133?via%3Dihub
UR  - http://hdl.handle.net/10044/1/80278
VL  - 139
ER  -
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