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{Chen:2020:10.1016/j.ijfatigue.2020.105517,
author = {Chen, B and Janssens, KGF and Dunne, FPE},
doi = {10.1016/j.ijfatigue.2020.105517},
journal = {International Journal of Fatigue},
title = {Role of geometrically necessary dislocation density in multiaxial and non-proportional fatigue crack nucleation},
url = {http://dx.doi.org/10.1016/j.ijfatigue.2020.105517},
volume = {135},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Experimental and crystal plasticity modelling studies have been carried out to investigate nonproportionality and stress state effects in fatigue in a 316 stainless steel and nickel-basedsuperalloy RR1000 which have substantial effects on fatigue life. Stored energy density hasprovided a reasonably consistent and unifying explanation for the experimental observationsof fatigue life in axial, torsional, in-phase proportional tension and torsion, and nonproportional loading regimes. A single fatigue quantity (the critical stored energy density,equating to new surface energy) has been shown to provide good qualitative and reasonablequantitative prediction of the experimental observations of the complex loading, providing amechanistic explanation for the fatigue behaviour. For the case where significant densities ofGNDs develop (for the fine-grained nickel), the latter is found to differentiate the proportionaland non-proportional fatigue lives and its contribution to the local stored energy is crucial forcapturing the correct fatigue lives under the differing loadings.
AU  - Chen,B
AU  - Janssens,KGF
AU  - Dunne,FPE
DO  - 10.1016/j.ijfatigue.2020.105517
PY  - 2020///
SN  - 0142-1123
TI  - Role of geometrically necessary dislocation density in multiaxial and non-proportional fatigue crack nucleation
T2  - International Journal of Fatigue
UR  - http://dx.doi.org/10.1016/j.ijfatigue.2020.105517
UR  - http://hdl.handle.net/10044/1/77921
VL  - 135
ER  -
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