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Non‐local high cycle fatigue strength criterion for metallic materials with corrosion defects
Author(s) -
El May Mohamed,
Saintier Nicolas,
PalinLuc Thierry,
Devos Olivier
Publication year - 2015
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.12329
Subject(s) - materials science , fatigue limit , corrosion , fatigue testing , stress (linguistics) , structural engineering , corrosion fatigue , composite material , metallurgy , engineering , philosophy , linguistics
This paper proposes a volumetric high cycle fatigue (HCF) strength criterion able to quantify the influence of natural corrosion pits on the fatigue limit of a martensitic stainless steel with high mechanical strength. Elastic–plastic numerical simulations were performed for real pits geometry, identified by X‐ray microtomography, to determine the local stress distribution. The analysis revealed that calculation of the fatigue strength for material with real (irregular) pit geometry required a non‐local HCF strength criterion. Such model was proposed based on the Crossland equivalent stress averaged within a volume limited by a critical distance. This criterion was validated with HCF tests on specimens with natural corrosion defects of different sizes.