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Technical Papers
Dec 6, 2021

Dislocation Density Evolution in Low-Cycle Fatigue of Steels Using Dislocation-Based Crystal Plasticity

Publication: Journal of Engineering Mechanics
Volume 148, Issue 2

Abstract

Dislocation accumulation caused by a crystallographic slip or plastic flow is one of the most critical factors for the growth of fatigue cracks. The dislocation density-based crystal plasticity method accounting for mobile and immobile dislocation densities has been widely used to evaluate crack behavior in polycrystals. However, the evolution of mobile and immobile dislocation densities in fatigue has not been carefully investigated, especially during the crack nucleation period. In the present study, a dislocation-based crystal plasticity model is employed and verified with experimental results. A representative domain with 39 grains is used to evaluate the dislocation density evolution in fatigue crack nucleation. The results indicate that mobile and immobile dislocation densities evolve at a decreasing rate in low plasticity and a constant rate in large plasticity for loading cases with constant strain amplitudes, whereas an increasing rate of dislocation density evolution is observed for loading cases with variable strain amplitudes. By analogy with cumulative plastic strain, a fatigue crack nucleation criterion is proposed, which is correlated well with the Coffin-Manson relationship. Based on a grain level analysis, a loading case with a low strain rate results in transgranular or mixed-mode (intergranular and transgranular) fatigue damage. In comparison, immobile dislocation density at a high strain rate mainly builds up at the grain boundary, indicating intergranular fatigue damage.

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Data Availability Statement

All of the data, models, or code that support the findings of this study are available from the corresponding author on reasonable request.

Acknowledgments

This material is based on work supported by the National Science Foundation (NSF Grant CMMI-1537121) and Research Excellence Program (REP) from the Office of the Vice President for Research (OVPR) of the University of Connecticut. This support is greatly appreciated. Any opinions, findings, conclusions, or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the sponsors.

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Go to Journal of Engineering Mechanics
Journal of Engineering Mechanics
Volume 148Issue 2February 2022

History

Received: Jan 16, 2021
Accepted: Oct 3, 2021
Published online: Dec 6, 2021
Published in print: Feb 1, 2022
Discussion open until: May 6, 2022

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Dongping Zhu, S.M.ASCE
Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of Connecticut, Storrs, CT 06269.
Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Connecticut, Storrs, CT 06269 (corresponding author). ORCID: https://orcid.org/0000-0001-8364-9953. Email: [email protected]; [email protected]
Zhixia Ding, S.M.ASCE
Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of Connecticut, Storrs, CT 06269.

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  • The RED criterion for fatigue life assessment of metals under non-proportional loading, International Journal of Fatigue, 10.1016/j.ijfatigue.2022.107080, 163, (107080), (2022).

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