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Article Dans Une Revue Materials Science and Engineering: A Année : 2010

Stage I surface crack formation in thermal fatigue: A predictive multi-scale approach

Christian Robertson
  • Fonction : Auteur
Maxime Sauzay
  • Fonction : Auteur

Résumé

A multi-scale numerical model is developed, predicting the formation of stage I cracks, in thermal fatigue loading conditions. The proposed approach comprises 2 distinct calculation steps. Firstly, the number of cycles to micro-crack initiation is determined, in individual grains. The adopted initiation model depends on local stress–strain conditions, relative to sub-grain plasticity, grain orientation and grain deformation incompatibilities. Secondly, 2–4 grains long surface cracks (stage I) is predicted, by accounting for micro-crack coalescence, in 3 dimensions. The method described in this paper is applied to a 500 grains aggregate, loaded in representative thermal fatigue conditions. Preliminary results provide quantitative insight regarding position, density, spacing and orientations of stage I surface cracks and subsequent formation of crack networks. The proposed method is fully deterministic, provided all grain crystallographic orientations and micro-crack linking thresholds are specified.

Dates et versions

hal-00531407 , version 1 (02-11-2010)

Identifiants

Citer

Stéphane Osterstock, Christian Robertson, Maxime Sauzay, Véronique Aubin, Suzanne Degallaix. Stage I surface crack formation in thermal fatigue: A predictive multi-scale approach. Materials Science and Engineering: A, 2010, 528 (1), pp.379-390. ⟨10.1016/j.msea.2010.09.019⟩. ⟨hal-00531407⟩

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