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

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

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 relation...

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Main Authors: Yifeng Hu, Junping Shi, Xiaoshan Cao, Jinju Zhi
Format: Article
Language:English
Published: MDPI AG 2021-05-01
Series:Materials
Subjects:
accumulated plastic strain energy density
low-cycle fatigue
modified Ramberg-Osgood model
fatigue life assessment
Online Access:https://www.mdpi.com/1996-1944/14/9/2372
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spelling doaj-ebefa259c6144f6fb6c25221adbd3e632021-05-31T23:05:05ZengMDPI AGMaterials1996-19442021-05-01142372237210.3390/ma14092372Low Cycle Fatigue Life Assessment Based on the Accumulated Plastic Strain Energy DensityYifeng Hu0Junping Shi1Xiaoshan Cao2Jinju Zhi3Department of Engineering Mechanics, Xi’an University of Technology, Xi’an 710048, ChinaDepartment of Engineering Mechanics, Xi’an University of Technology, Xi’an 710048, ChinaDepartment of Engineering Mechanics, Xi’an University of Technology, Xi’an 710048, ChinaDepartment of Engineering Mechanics, Xi’an University of Technology, Xi’an 710048, ChinaThe 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.https://www.mdpi.com/1996-1944/14/9/2372accumulated plastic strain energy densitylow-cycle fatiguemodified Ramberg-Osgood modelfatigue life assessment
collection DOAJ
language English
format Article
sources DOAJ
author Yifeng Hu
Junping Shi
Xiaoshan Cao
Jinju Zhi
spellingShingle Yifeng Hu
Junping Shi
Xiaoshan Cao
Jinju Zhi
Low Cycle Fatigue Life Assessment Based on the Accumulated Plastic Strain Energy Density
Materials
accumulated plastic strain energy density
low-cycle fatigue
modified Ramberg-Osgood model
fatigue life assessment
author_facet Yifeng Hu
Junping Shi
Xiaoshan Cao
Jinju Zhi
author_sort Yifeng Hu
title Low Cycle Fatigue Life Assessment Based on the Accumulated Plastic Strain Energy Density
title_short Low Cycle Fatigue Life Assessment Based on the Accumulated Plastic Strain Energy Density
title_full Low Cycle Fatigue Life Assessment Based on the Accumulated Plastic Strain Energy Density
title_fullStr Low Cycle Fatigue Life Assessment Based on the Accumulated Plastic Strain Energy Density
title_full_unstemmed Low Cycle Fatigue Life Assessment Based on the Accumulated Plastic Strain Energy Density
title_sort low cycle fatigue life assessment based on the accumulated plastic strain energy density
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2021-05-01
description 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.
topic accumulated plastic strain energy density
low-cycle fatigue
modified Ramberg-Osgood model
fatigue life assessment
url https://www.mdpi.com/1996-1944/14/9/2372
work_keys_str_mv AT yifenghu lowcyclefatiguelifeassessmentbasedontheaccumulatedplasticstrainenergydensity
AT junpingshi lowcyclefatiguelifeassessmentbasedontheaccumulatedplasticstrainenergydensity
AT xiaoshancao lowcyclefatiguelifeassessmentbasedontheaccumulatedplasticstrainenergydensity
AT jinjuzhi lowcyclefatiguelifeassessmentbasedontheaccumulatedplasticstrainenergydensity
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