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Fatigue crack growth prediction for small-scale yielding (SSY) and non-SSY conditions

Lookup NU author(s): Ankang Cheng, Dr Yongchang Pu

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Abstract

© 2020 Elsevier LtdA model to predict fatigue crack growth (FCG) for small-scale yielding (SSY) and non-SSY conditions where J-integral applies is established. The ΔJ-characterized elastic-plastic fracture mechanics (EPFM) analysis is performed based on a rearranged FCG process to achieve the crack-tip geometry and stress state. The root stress of blunted crack and the FCG rate are calculated from the cycle-wise local and global energy balance. To consider effects of geometry, load level and strain hardening, a correction factor is further developed in the governing equation of global energy balance. The model is validated using the test data of several types of metals.

Publication metadata

Author(s): Cheng A, Chen N-Z, Pu Y, Yu J

Publication type: Article

Publication status: Published

Journal: International Journal of Fatigue

Year: 2020

Volume: 139

Print publication date: 01/10/2020

Online publication date: 28/06/2020

Acceptance date: 06/06/2020

ISSN (print): 0142-1123

ISSN (electronic): 1879-3452

Publisher: Elsevier Ltd

URL: https://doi.org/10.1016/j.ijfatigue.2020.105768

DOI: 10.1016/j.ijfatigue.2020.105768

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