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{Wilson:2019:10.1016/j.jmps.2019.02.012,
author = {Wilson, D and Wan, W and Dunne, FPE},
doi = {10.1016/j.jmps.2019.02.012},
journal = {Journal of the Mechanics and Physics of Solids},
pages = {204--225},
title = {Microstructurally-sensitive fatigue crack growth in HCP, BCC and FCC polycrystals},
url = {http://dx.doi.org/10.1016/j.jmps.2019.02.012},
volume = {126},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Microstructurally sensitive fatigue crack growth in four material systems with BCC, FCC and HCP crystallography was investigated through integrated crystal plasticity eXtended Finite Element (XFEM) modelling and experiment. The mechanistic drivers for crack path tortuosity and propagation rate have been investigated and crack propagation found to be controlled by crack tip stored energy and the crack direction by anisotropic crystallographic slip at the crack tip. Experimentally observed microstructurally-sensitive fatigue crack path tortuosities and growth rates in titanium alloy (Ti-6Al-4V), ferritic steel, nickel superalloy and zirconium alloy (zircaloy 4) have been shown to be captured, supporting the underpinning mechanistic arguments. Very short crack growth is dominated by local slip, but with increasing length, crack tip stresses begins to predominate, increasing the availability of slip systems and giving smaller amplitude oscillations between slip systems. This leads to overall crack paths which are in fact crystallographic but which appear not to be. Key features of crack retardation at grain boundaries, changes in rate resulting from crystallography, and intragranular crack path deflections have been experimentally observed and captured.
AU  - Wilson,D
AU  - Wan,W
AU  - Dunne,FPE
DO  - 10.1016/j.jmps.2019.02.012
EP  - 225
PY  - 2019///
SN  - 0022-5096
SP  - 204
TI  - Microstructurally-sensitive fatigue crack growth in HCP, BCC and FCC polycrystals
T2  - Journal of the Mechanics and Physics of Solids
UR  - http://dx.doi.org/10.1016/j.jmps.2019.02.012
UR  - https://www.sciencedirect.com/science/article/pii/S0022509618310524
UR  - http://hdl.handle.net/10044/1/66978
VL  - 126
ER  -
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