Microstructural fracture mechanics: Stored energy density at fatigue cracks

This paper addresses the mechanistic drivers of short fatigue crack growth using theory, computational crystal plasticity and experimental test and characterisation. The asymptotic theory shows that the crack tip stored energy density is non-singular and finite and can be related to stress intensity...

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Bibliographic Details
Published in:Journal of the mechanics and physics of solids 2021-01, Vol.146, p.104209, Article 104209
Main Authors: Xu, Yilun, Wan, Weifeng, Dunne, Fionn P.E.
Format: Article
Language:English
Subjects:
Asymptotic properties
Burgers vector
Crack propagation
Crack tips
Cracks
Fatigue cracks
Fatigue failure
Fatigue tests
Flux density
Fracture mechanics
Internal energy
Microstructure
Short crack growth
Short cracks
Stored energy
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Summary:This paper addresses the mechanistic drivers of short fatigue crack growth using theory, computational crystal plasticity and experimental test and characterisation. The asymptotic theory shows that the crack tip stored energy density is non-singular and finite and can be related to stress intensity, but unlike the latter, it depends on the crystal Burgers vector and intrinsic slip strength. The computational methods allow the stored energy to be calculated accurately at crack tips and show that good agreement is obtained for static cracks with the theory. The experiments allow the crack tip stored energy to be measured, demonstrating intimate microstructural sensitivity, direct correlation with experimental crack growth variations and good quantitative agreement with both asymptotic theory and computational modelling. Hence a new microstructurally-sensitive fracture mechanics has been presented in the context of short cracks within crystalline materials.
ISSN:0022-5096
1873-4782
DOI:10.1016/j.jmps.2020.104209