Deformation fields near a steady fatigue crack with anisotropic plasticity
Abstract
In this work, from finite element simulations based on an irreversible, hysteretic cohesive interface model, a steady fatigue crack can be realized if the crack extension exceeds about twice the plastic zone size, and both the crack increment per loading cycle and the crack bridging zone size are smaller than the plastic zone size. The corresponding deformation fields develop a plastic wake behind the crack tip and a compressive residual stress field ahead of the crack tip. In addition, the Hill’s plasticity model is used to study the role of plastic anisotropy on the retardation of fatigue crack growth and the elastic strain fields. It is found that for Mode-I cyclic loading, an enhanced yield stress in directions that are inclined from the crack plane will lead to slower crack growth rate, but this retardation is insignificant for typical degrees of plastic anisotropy. Furthermore, these results provide key inputs for future comparisons to neutron and synchrotron diffraction measurements that provide full-field lattice strain mapping near fracture and fatigue crack tips, especially in textured materials such as wrought or rolled Mg alloys.
- Authors:
-
- Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1237623
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Extreme Mechanics Letters
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: C; Journal ID: ISSN 2352-4316
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; fatigue; cohesive interface simulations; anisotropic plasticity
Citation Formats
Gao, Yanfei. Deformation fields near a steady fatigue crack with anisotropic plasticity. United States: N. p., 2015.
Web. doi:10.1016/j.eml.2015.11.006.
Gao, Yanfei. Deformation fields near a steady fatigue crack with anisotropic plasticity. United States. https://doi.org/10.1016/j.eml.2015.11.006
Gao, Yanfei. Mon .
"Deformation fields near a steady fatigue crack with anisotropic plasticity". United States. https://doi.org/10.1016/j.eml.2015.11.006. https://www.osti.gov/servlets/purl/1237623.
@article{osti_1237623,
title = {Deformation fields near a steady fatigue crack with anisotropic plasticity},
author = {Gao, Yanfei},
abstractNote = {In this work, from finite element simulations based on an irreversible, hysteretic cohesive interface model, a steady fatigue crack can be realized if the crack extension exceeds about twice the plastic zone size, and both the crack increment per loading cycle and the crack bridging zone size are smaller than the plastic zone size. The corresponding deformation fields develop a plastic wake behind the crack tip and a compressive residual stress field ahead of the crack tip. In addition, the Hill’s plasticity model is used to study the role of plastic anisotropy on the retardation of fatigue crack growth and the elastic strain fields. It is found that for Mode-I cyclic loading, an enhanced yield stress in directions that are inclined from the crack plane will lead to slower crack growth rate, but this retardation is insignificant for typical degrees of plastic anisotropy. Furthermore, these results provide key inputs for future comparisons to neutron and synchrotron diffraction measurements that provide full-field lattice strain mapping near fracture and fatigue crack tips, especially in textured materials such as wrought or rolled Mg alloys.},
doi = {10.1016/j.eml.2015.11.006},
journal = {Extreme Mechanics Letters},
number = C,
volume = 6,
place = {United States},
year = {Mon Nov 30 00:00:00 EST 2015},
month = {Mon Nov 30 00:00:00 EST 2015}
}
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