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


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), 1305-1317. (doi:10.1016/j.actamat.2003.11.014).

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Description/Abstract

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.

Item Type: Article
ISSNs: 1359-6454 (print)
Related URLs:
Keywords: fatigue, aluminium alloys, image analysis, local crack driving force, synchrotron radiation
Subjects: T Technology > TN Mining engineering. Metallurgy
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 22925
Date Deposited: 23 Mar 2006
Last Modified: 27 Mar 2014 18:12
Contact Email Address: is1@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/22925

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