Journal
ACTA MATERIALIA
Volume 78, Issue -, Pages 341-353Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.06.044
Keywords
Size effect; Fatigue behaviour; Crystal plasticity; Geometrically necessary dislocations; Finite element
Funding
- Irish Research Council under the EMBARK Initiative Scheme
- Irish Centre for High-End Computing (ICHEC)
- Engineering and Physical Sciences Research Council [EP/C509870/1] Funding Source: researchfish
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A strain-gradient crystal plasticity framework based on physical dislocation mechanisms is developed for simulation of the experimentally observed grain size effect on the low cycle fatigue of a CoCr alloy. Finite-element models of the measured microstructure are presented for both as-received and heat-treated CoCr material, with significantly different grain sizes. Candidate crystallographic slip-based parameters are implemented for prediction of fatigue crack initiation. The measured beneficial effects of fine grain size on both cyclic stress strain response and crack initiation life are predicted. The build-up of geometrically necessary dislocations as a result of strain-gradients, leading to grain-size-dependent material hardening, is shown to play a key role. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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