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Non-local high cycle fatigue strength criterion for metallic materials with corrosion defects

Article dans une revue avec comité de lecture
Author
EL MAY, Mohamed
ccSAINTIER, Nicolas
ccPALIN-LUC, Thierry
DEVOS, Olivier

URI
http://hdl.handle.net/10985/10018
DOI
10.1111/ffe.12329
Date
2015
Journal
Fatigue and Fracture of Engineering Materials and Structures

Abstract

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.

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