Imperial College London
Emeritus Professor Trevor Lindley

Emeritus ProfessorTrevorLindley

Faculty of Engineering, Department of Materials

Emeritus Professor
 
 
 
//

Contact

 

+44 (0)20 7594 6735t.lindley

 
 
//

Location

 

Goldsmiths 106Royal School of MinesSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Chapman:2015:10.1016/j.actamat.2015.07.069,
author = {Chapman, TP and Kareh, KM and Knop, M and Connolley, T and Lee, PD and Azeem, MA and Rugg, D and Lindley, TC and Dye, D},
doi = {10.1016/j.actamat.2015.07.069},
journal = {Acta Materialia},
pages = {49--62},
title = {Characterisation of short fatigue cracks in titanium alloy IMI 834 using X-ray microtomography},
url = {http://dx.doi.org/10.1016/j.actamat.2015.07.069},
volume = {99},
year = {2015}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A first attempt at the three-dimensional evaluation of naturally initiated surface connected and internal fatigue cracks is presented. Fatigue crack initiation and growth in air and vacuum environments have been investigated through X-ray microtomography in air and vacuum environments at elevated temperatures (350 °C), accompanied by post-mortem electron microscopy of the fracture surfaces. In vacuum (<10 mbar), multiple internal and surface-connected crack initiation was observed, but only the surface-connected cracks grew. In contrast, fewer cracks formed in air, these were mostly surface-connected and all were observed to grow. In all instances the initiation features were associated with globular primary α. An improved fatigue life was found in vacuum, which was mostly a consequence of delayed initiation, but was also due to slower fatigue crack propagation. The non-propagation of internal cracks was taken to imply that even the good laboratory vacuum obtained here was insufficient to simulate the conditions obtained for an internal crack in a component. The crack shape evolved towards a semi-circular shape a/c=1 in air during fatigue crack growth, whilst the vacuum cracks remained semi-elliptical (a/c1.4). This was taken to imply that oxide-induced crack closure played a role in fatigue crack growth in air.
AU  - Chapman,TP
AU  - Kareh,KM
AU  - Knop,M
AU  - Connolley,T
AU  - Lee,PD
AU  - Azeem,MA
AU  - Rugg,D
AU  - Lindley,TC
AU  - Dye,D
DO  - 10.1016/j.actamat.2015.07.069
EP  - 62
PY  - 2015///
SN  - 1359-6454
SP  - 49
TI  - Characterisation of short fatigue cracks in titanium alloy IMI 834 using X-ray microtomography
T2  - Acta Materialia
UR  - http://dx.doi.org/10.1016/j.actamat.2015.07.069
UR  - https://www.sciencedirect.com/science/article/pii/S1359645415005558
UR  - http://hdl.handle.net/10044/1/27116
VL  - 99
ER  -
Download