Fatigue life calculation for a specimen with an impact pit considering impact damage, residual stress relaxation and elastic-plastic fatigue damage

•A new method to calculate fatigue life of specimen with impact pit is proposed.•The initial impact damage and elastic-plastic fatigue damage are considered.•The residual stress relaxation is investigated in this method.•The calculated results agree well with the experimental result. In this study,...

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Bibliographic Details
Published inInternational journal of fatigue Vol. 96; pp. 208 - 223
Main Authors Zhan, Zhixin, Hu, Weiping, Shen, Fei, Meng, Qingchun, Pu, Jing, Guan, Zhidong
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.03.2017
Elsevier BV
Subjects
Continuum damage mechanics
Crack propagation
Cyclic loads
Damage mechanics
Elastic-plastic
Fatigue failure
Fatigue life
Impact damage
Materials fatigue
Mathematical analysis
Residual stress
Stress relaxation
Damage mechanics
Fatigue life
Elastic-plastic
Impact damage
Residual stress
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Summary:•A new method to calculate fatigue life of specimen with impact pit is proposed.•The initial impact damage and elastic-plastic fatigue damage are considered.•The residual stress relaxation is investigated in this method.•The calculated results agree well with the experimental result. In this study, a continuum damage mechanics based method is proposed to calculate the fatigue life of a specimen with an impact pit. The impact process is simulated by a quasi-static analysis. The residual stress and the impact damage are calculated. Then, the elastic-plastic fatigue damage of the material is considered as the specimen experiences cyclic loading. The residual stress relaxation is investigated via a coupled analysis of the residual stress and elastic-plastic damage evolution. The calculated results agree well with the experimental results. The effects of the impact depth and radius that the impact object has on the fatigue failure are also discussed.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2016.11.036