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A 3D measurement procedure for internal local crack driving forces via synchrotron X-ray microtomography

Record type: Article

Synchrotron X-ray microtomography has been utilized for the in situ observation of fatigue crack opening/closure during load cycles. High-resolution phase contrast imaging technique has enabled the reconstruction of clear crack images together with the details of microstructural features. Physical displacements of micro-pores in a crack-tip stress field are used to obtain local mixed-mode crack driving forces along a crack front, and its feasibility is confirmed. Complicated crack closure behaviour are observed due to the combined effects of local modes II and III displacements. The technique used provides a highly effective way of assessing local crack driving forces together with supplementary ways of verifying and interpreting it by visualising and quantifying various forms of crack-tip shielding behaviour. The proposed technique is clearly advantageous compared to the limited procedures available in the current literature, where detailed internal information can only be achieved for limited types of material.

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Citation

Toda, H., Sinclair, I., Buffière, J. -Y., Maire, E., Khor, K.H., Gregson, P. and Kobayashi, T. (2004) A 3D measurement procedure for internal local crack driving forces via synchrotron X-ray microtomography Acta Materialia, 52, (5), pp. 1305-1317. (doi:10.1016/j.actamat.2003.11.014).

More information

Published date: 2004
Keywords: fatigue, aluminium alloys, image analysis, local crack driving force, synchrotron radiation

Identifiers

Local EPrints ID: 22925
URI: http://eprints.soton.ac.uk/id/eprint/22925
ISSN: 1359-6454
PURE UUID: 57b75286-097b-4eaa-b61f-ec0c2d455961

Catalogue record

Date deposited: 23 Mar 2006
Last modified: 17 Jul 2017 16:20

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Contributors

Author: H. Toda
Author: I. Sinclair
Author: J. -Y. Buffière
Author: E. Maire
Author: K.H. Khor
Author: P. Gregson
Author: T. Kobayashi

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