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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12431
Title: Surface versus internal fatigue crack initiation in steel: Influence of mean stress
Authors: Gaur V.
Doquet V.
Persent E.
Mareau C.
Roguet E.
Kittel J.
Published in: International Journal of Fatigue
Abstract: Stress-controlled fatigue tests were run at different R ratios (=σmin/σmax) up to at most 3 million cycles on a 2.5%Cr-1%Mo steel (ASTM A182 F22) used in riser tubes connectors for offshore oil drilling. The fatigue lives, as well as the slope of the S-N curves were found to decrease with increasing R and the endurance limit to follow Gerber's parabola. Surface crack initiation without any defect involved, was most often observed for R = -1, -0.5 and 0, while an R ratio of 0.25 triggered crack initiation from either surface or internal pores or chemically inhomogeneous areas, leading, in the latter case, to fish-eye patterns for relatively low numbers of cycles. A further increase in R ratio to 0.5 promoted only defect-initiated surface cracks, while no fatigue fracture was observed within 10 million cycles above R=0.6. These transitions in crack initiation mode are discussed based on X-ray diffraction analyses of residual stresses, elastic-plastic F.E. computations on a unit cell model containing a pore and some fracture mechanics analyses, with a particular attention to environmental effects. © 2015 Elsevier Ltd. All rights reserved.
Citation: International Journal of Fatigue (2015), 82(): 437-448
URI: https://doi.org/10.1016/j.ijfatigue.2015.08.028
http://repository.iitr.ac.in/handle/123456789/12431
Issue Date: 2015
Publisher: Elsevier Ltd
Keywords: Defects
Fish-eye
Internal crack
Mean stress
Steel
ISSN: 1421123
Author Scopus IDs: 56229535200
6603630559
35198632700
25121899100
56229926900
25521952300
Author Affiliations: Gaur, V., LMS, Ecole Polytechnique, Université Paris-Saclay, UMR CNRS 7649, Palaiseau, France, IFP Energies Nouvelles, 1 et 4 avenue de Bois-Préau, Rueil-Malmaison, 92852, France
Doquet, V., LMS, Ecole Polytechnique, Université Paris-Saclay, UMR CNRS 7649, Palaiseau, France
Persent, E., IFP Energies Nouvelles, 1 et 4 avenue de Bois-Préau, Rueil-Malmaison, 92852, France
Mareau, C., LAMPA, Arts et Métier Paris Tech, 2 Boulevard du Ronceray, Angers, 49035, France
Roguet, E., IFP Energies Nouvelles, 1 et 4 avenue de Bois-Préau, Rueil-Malmaison, 92852, France
Kittel, J., IFP Energies Nouvelles, Rond-point de Léchangeur de Solaize, BP3 69360, Solaize, France
Corresponding Author: Doquet, V.; LMS, Ecole Polytechnique, Université Paris-Saclay, UMR CNRS 7649France
Appears in Collections:Journal Publications [ME]

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