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

journal contribution
posted on 07.12.2020, 14:41 by ping Zhang, Lu Zhang, Konstantinos Baxevanakis, S Lu, Liguo Zhao, Chris Bullough
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.

Funding

Dislocation-Microstructure Interaction at a Crack Tip - In Search of a Driving Force for Short Crack Growth

Engineering and Physical Sciences Research Council

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Oxidation Damage at a Crack Tip and Its Significance in Crack Growth under Fatigue-Oxidation Conditions

Engineering and Physical Sciences Research Council

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China Scholarship Council (CSC, No. 201806290092)

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

International Journal of Fatigue

Volume

145

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal International Journal of Fatigue and the definitive published version is available at https://doi.org/10.1016/j.ijfatigue.2020.106095

Acceptance date

05/12/2020

Publication date

2020-12-15

Copyright date

2020

ISSN

0142-1123

Language

en

Depositor

Prof Liguo Zhao Deposit date: 5 December 2020

Article number

106095