The determination of the local conditions for void initiation in front of a crack tip for materials with second-phase particles

Sabirov, Ilchat, Duschlbauer, D., Pettermann, H. E. and Kolednik, O. 2005, The determination of the local conditions for void initiation in front of a crack tip for materials with second-phase particles, Materials science & engineering. A, Structural materials, vol. 393, no. 1-2, pp. 275-285.

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Title The determination of the local conditions for void initiation in front of a crack tip for materials with second-phase particles
Author(s) Sabirov, Ilchat
Duschlbauer, D.
Pettermann, H. E.
Kolednik, O.
Journal name Materials science & engineering. A, Structural materials
Volume number 393
Issue number 1-2
Start page 275
End page 285
Publisher Elsevier SA
Place of publication Lausanne, Switzerland
Publication date 2005-02-25
ISSN 0921-5093
1873-4936
Keyword(s) stereophotogrammetry
HRR theory
mean field analysis
particle fracture stress
void initiation
Summary A procedure is proposed to determine, for second-phase particles near a crack tip, the maximum particle stresses at the moment of void initiation by either particle fracture or particle/matrix interface separation. A digital image analysis system is applied to perform a quantitative analysis of corresponding fracture surface regions from stereo image pairs taken in the scanning electron microscope. The fracture surface analysis is used to measure, for individual particles, the crack tip opening displacement at the moment of void initiation and the particle location with respect to the crack tip. From these data, the stress tensor at the moment of void initiation is calculated from the Hutchinson–Rice–Rosengren (HRR) field theory. The corresponding average local stresses within the particle are evaluated by a non-linear Mori–Tanaka-type approach. These stresses are compared to estimates according to the models by Argon et al. [A.S. Argon, J. Im, R. Safoglu, Metall. Trans. 6 (1975) 825] and Beremin [F.M. Beremin, Metall. Trans. 12 (1981) 723]. The procedure is demonstrated on an Al6061–10% Al2O3 metal matrix composite.
Language eng
Field of Research 091202 Composite and Hybrid Materials
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2004, Elsevier B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30004412

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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