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{Zheng:2017:10.1016/j.jmps.2017.07.010,
author = {Zheng, Z and Balint, D and Dunne, F},
doi = {10.1016/j.jmps.2017.07.010},
journal = {Journal of the Mechanics and Physics of Solids},
pages = {185--203},
title = {Mechanistic basis of temperature-dependent dwell fatigue in titanium alloys},
url = {http://dx.doi.org/10.1016/j.jmps.2017.07.010},
volume = {107},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The temperature-dependent dwell sensitivity of Ti-6242 and Ti-6246 alloys has been assessed over a temperature range from −50C to 390°C  using discrete dislocation plasticity which incorporates both thermal activation of dislocation escape from obstacles and slip transfer across grain boundaries. The worst-case load shedding in Ti-6242 alloy is found to be at or close to 120°C  under dwell fatigue loading, which diminishes and vanishes at temperatures lower than −50C or higher than 230°C. Load shedding behaviour is predicted to occur in alloy Ti-6246 also but over a range of higher temperatures which are outside those relevant to in-service conditions. The key controlling dislocation mechanism with respect to load shedding in titanium alloys, and its temperature sensitivity, is shown to be the time constant associated with the thermal activation of dislocation escape from obstacles, with respect to the stress dwell time. The mechanistic basis of load shedding and dwell sensitivity in dwell fatigue loading is presented and discussed in the context of experimental observations.
AU  - Zheng,Z
AU  - Balint,D
AU  - Dunne,F
DO  - 10.1016/j.jmps.2017.07.010
EP  - 203
PY  - 2017///
SN  - 0022-5096
SP  - 185
TI  - Mechanistic basis of temperature-dependent dwell fatigue in titanium alloys
T2  - Journal of the Mechanics and Physics of Solids
UR  - http://dx.doi.org/10.1016/j.jmps.2017.07.010
UR  - http://hdl.handle.net/10044/1/50100
VL  - 107
ER  -
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