Discrete crystal plasticity modelling of slip-controlled cyclic deformation and short crack growth under low cycle fatigue

•Explicitly introducing discrete slip bands to crystal plasticity model.•Investigating slip-controlled cyclic deformation and short crack growth.•Normal factor-based CRSS to describe orientation-dependent stress-strain responses.•Using cumulative shear strain and element deletion for crack growth mo...

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Bibliographic Details
Published in:International journal of fatigue 2021-04, Vol.145, p.106095, Article 106095
Main Authors: Zhang, P., Zhang, L., Baxevanakis, K.P., Lu, S., Zhao, L.G., Bullough, C.
Format: Article
Language:English
Subjects:
Crack initiation
Crack propagation
Crystal Plasticity
Cumulative shear strain
Deformation
Discrete slip bands
Edge dislocations
Element deletion
Fatigue cracks
Low cycle fatigue
Materials fatigue
Metal fatigue
Plastic properties
Predictive control
Shear strain
Shear stress
Short crack growth
Short cracks
Single crystals
Strain localization
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Summary:•Explicitly introducing discrete slip bands to crystal plasticity model.•Investigating slip-controlled cyclic deformation and short crack growth.•Normal factor-based CRSS to describe orientation-dependent stress-strain responses.•Using cumulative shear strain and element deletion for crack growth modelling.•Capable of predicting tortuous paths and irregular growth rates for short cracks. For metals under fatigue, microplastic strain localisation leads to the formation of discrete slip bands, which contributes to the initiation and propagation of short cracks. In this paper, a discrete slip band model is introduced to investigate the slip-controlled cyclic deformation and short crack growth in a single crystal alloy. In conjunction with crystal plasticity and normal factor-based critical resolved shear stress, finite element simulations demonstrated the success of the discrete model in describing orientation-dependent cyclic stress-strain responses. The proposed approach is also capable of predicting slip-controlled short crack growth, based on element deletion technique and individual cumulative shear strain criterion.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2020.106095