Evaluating the influence of residual stresses and surface damage on fatigue life of nickel superalloys

•The effect of residual stresses on crack propagation under dents is evaluated.•A dislocation density approach is used to obtain the ΔK of cracks under dents.•Compressive residual stress increases predicted life and change the fatigue limit. The effect of surface damage, such as dents caused due to...

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Bibliographic Details
Published inInternational journal of fatigue Vol. 105; pp. 27 - 33
Main Authors Fleury, R.M.N., Nowell, D.
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.12.2017
Elsevier BV
Subjects
Aluminum alloys
Aluminum base alloys
Bending fatigue
Bending stresses
Computer simulation
Crack propagation
Cracks
Damage assessment
Fatigue
Fatigue cracks
Fatigue failure
Fatigue life
Finite element method
Fracture mechanics
Friction stir welding
Materials fatigue
Mathematical models
Mechanical properties
Nickel base alloys
Nickel superalloys
Plates (structural members)
Residual stress
Residual stresses
Superalloys
Surface damage
Tee joints
Three dimensional models
Welded joints
Fatigue
Nickel superalloys
Residual stresses
Surface damage
Crack propagation
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Summary:•The effect of residual stresses on crack propagation under dents is evaluated.•A dislocation density approach is used to obtain the ΔK of cracks under dents.•Compressive residual stress increases predicted life and change the fatigue limit. The effect of surface damage, such as dents caused due to the low velocity impact of hard blunt objects, on the fatigue life of mechanical components are investigated in this paper. A two-dimensional dislocation density approach is used to obtain the stress intensity factors of a crack propagating under dents. Both the contributions of the geometrical stress concentrator (notch), due to the presence of the dent, and the residual stress field, generated during the impact, on the stress intensity factor of the crack are obtained. A short crack growth model is then used to predict the fatigue life of nickel superalloys in the presence of two dent depths. The effect of the residual stress field has been shown to be the main contributor to the difference observed in predicted fatigue life between the two dent depths analysed.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2017.08.015