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Article

Low Cycle Fatigue Life Assessment Based on the Accumulated Plastic Strain Energy Density

by
Yifeng Hu
*,
Junping Shi
,
Xiaoshan Cao
and
Jinju Zhi
Department of Engineering Mechanics, Xi’an University of Technology, Xi’an 710048, China
*
Author to whom correspondence should be addressed.
Materials 2021, 14(9), 2372; https://doi.org/10.3390/ma14092372
Submission received: 3 April 2021 / Revised: 27 April 2021 / Accepted: 30 April 2021 / Published: 2 May 2021
(This article belongs to the Special Issue Research on Fatigue Behavior of Metals and Alloys)
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Abstract

The accumulated plastic strain energy density at a dangerous point is studied to estimate the low cycle fatigue life that is composed of fatigue initiation life and fatigue crack propagation life. The modified Ramberg–Osgood constitutive relation is applied to characterize the stress–strain relationship of the strain-hardening material. The plastic strain energy density under uni-axial tension and cyclic load are derived, which are used as threshold and reference values, respectively. Then, a framework to assess the lives of fatigue initiation and fatigue crack propagation by accumulated plastic strain energy density is proposed. Finally, this method is applied to two types of aluminum alloy, LC9 and LY12 for low-cycle fatigue, and agreed well with the experiments.
Keywords: accumulated plastic strain energy density; low-cycle fatigue; modified Ramberg-Osgood model; fatigue life assessment accumulated plastic strain energy density; low-cycle fatigue; modified Ramberg-Osgood model; fatigue life assessment

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MDPI and ACS Style

Hu, Y.; Shi, J.; Cao, X.; Zhi, J. Low Cycle Fatigue Life Assessment Based on the Accumulated Plastic Strain Energy Density. Materials 2021, 14, 2372. https://doi.org/10.3390/ma14092372

AMA Style

Hu Y, Shi J, Cao X, Zhi J. Low Cycle Fatigue Life Assessment Based on the Accumulated Plastic Strain Energy Density. Materials. 2021; 14(9):2372. https://doi.org/10.3390/ma14092372

Chicago/Turabian Style

Hu, Yifeng, Junping Shi, Xiaoshan Cao, and Jinju Zhi. 2021. "Low Cycle Fatigue Life Assessment Based on the Accumulated Plastic Strain Energy Density" Materials 14, no. 9: 2372. https://doi.org/10.3390/ma14092372

APA Style

Hu, Y., Shi, J., Cao, X., & Zhi, J. (2021). Low Cycle Fatigue Life Assessment Based on the Accumulated Plastic Strain Energy Density. Materials, 14(9), 2372. https://doi.org/10.3390/ma14092372

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