A modified constitutive model for tensile deformation of 9%Cr steel under prior fatigue loading

Wei Zhang, Xiaowei Wang, Haofeng Chen, Tianyu Zhang, Jianming Gong

Research output: Contribution to journalArticle

Abstract

Reliable constitutive models are necessary for the precise design and manufacture of complicated components. This study is devoted to developing a modified constitutive model to capture the effects of prior fatigue loading on subsequent tensile deformation of 9%Cr steel. In the proposed model, a strain hardening rule combined with a defined fatigue damage parameter was introduced to represent prior fatigue damage. The defined fatigue damage parameter based on the inelastic strain range of each cycle is capable of describing the evolution of tensile strength, recovery of martensite laths and decline of dislocation density, regardless of the variation in fatigue loading conditions. To validate the predictive capacity of the proposed model, experimental tensile results at different strain amplitudes, lifetime fractions and hold times of prior fatigue loading were compared with the predicted results. Good agreement between experimental and predicted results indicates that the proposed model is robust in describing the tensile behaviour under prior fatigue loading. Moreover, few determined material parameters are required, which makes the proposed model convenient for practical applications.

LanguageEnglish
Article number103093
Number of pages12
JournalMechanics of Materials
Volume136
Early online date17 Jun 2019
DOIs
Publication statusPublished - 30 Sep 2019

Fingerprint

tensile deformation
Steel
Constitutive models
Fatigue damage
steels
Fatigue of materials
damage
Strain hardening
Martensite
Tensile strength
strain hardening
martensite
Recovery
tensile strength
recovery
life (durability)
cycles

Keywords

  • 9%Cr steel
  • prior fatigue loading
  • constitutive model
  • fatigue damage parameter

Cite this

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abstract = "Reliable constitutive models are necessary for the precise design and manufacture of complicated components. This study is devoted to developing a modified constitutive model to capture the effects of prior fatigue loading on subsequent tensile deformation of 9{\%}Cr steel. In the proposed model, a strain hardening rule combined with a defined fatigue damage parameter was introduced to represent prior fatigue damage. The defined fatigue damage parameter based on the inelastic strain range of each cycle is capable of describing the evolution of tensile strength, recovery of martensite laths and decline of dislocation density, regardless of the variation in fatigue loading conditions. To validate the predictive capacity of the proposed model, experimental tensile results at different strain amplitudes, lifetime fractions and hold times of prior fatigue loading were compared with the predicted results. Good agreement between experimental and predicted results indicates that the proposed model is robust in describing the tensile behaviour under prior fatigue loading. Moreover, few determined material parameters are required, which makes the proposed model convenient for practical applications.",
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A modified constitutive model for tensile deformation of 9%Cr steel under prior fatigue loading. / Zhang, Wei; Wang, Xiaowei; Chen, Haofeng; Zhang, Tianyu; Gong, Jianming.

In: Mechanics of Materials, Vol. 136, 103093, 30.09.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A modified constitutive model for tensile deformation of 9%Cr steel under prior fatigue loading

AU - Zhang, Wei

AU - Wang, Xiaowei

AU - Chen, Haofeng

AU - Zhang, Tianyu

AU - Gong, Jianming

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AB - Reliable constitutive models are necessary for the precise design and manufacture of complicated components. This study is devoted to developing a modified constitutive model to capture the effects of prior fatigue loading on subsequent tensile deformation of 9%Cr steel. In the proposed model, a strain hardening rule combined with a defined fatigue damage parameter was introduced to represent prior fatigue damage. The defined fatigue damage parameter based on the inelastic strain range of each cycle is capable of describing the evolution of tensile strength, recovery of martensite laths and decline of dislocation density, regardless of the variation in fatigue loading conditions. To validate the predictive capacity of the proposed model, experimental tensile results at different strain amplitudes, lifetime fractions and hold times of prior fatigue loading were compared with the predicted results. Good agreement between experimental and predicted results indicates that the proposed model is robust in describing the tensile behaviour under prior fatigue loading. Moreover, few determined material parameters are required, which makes the proposed model convenient for practical applications.

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