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


Autoria(s): Sabirov, Ilchat; Duschlbauer, D.; Pettermann, H. E.; Kolednik, O.
Data(s)

25/02/2005

Resumo

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.<br />

Identificador

http://hdl.handle.net/10536/DRO/DU:30004412

Idioma(s)

eng

Publicador

Elsevier SA

Relação

http://dro.deakin.edu.au/eserv/DU:30004412/n20071135.pdf

http://dx.doi.org/10.1016/j.msea.2004.10.013

Direitos

2004, Elsevier B.V.

Palavras-Chave #stereophotogrammetry #HRR theory #mean field analysis #particle fracture stress #void initiation
Tipo

Journal Article