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dc.contributor.author
 hal.structure.identifier
LAAMOURI, Adnen
39735 Institut Supérieur des Sciences Appliquées et de Technologie de Sousse [ISSATS]
dc.contributor.authorSIDHOM, Habib
dc.contributor.author
 hal.structure.identifier
BRAHAM, Chedly
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
dc.date.accessioned2014
dc.date.available2014
dc.date.issued2013
dc.date.submitted2014
dc.identifier.issn0142-1123
dc.identifier.urihttp://hdl.handle.net/10985/8135
dc.description.abstractThis paper is aimed at evaluating the residual stress relaxation and its effect on the fatigue strength of AISI 316L steel ground surfaces in comparison to electro-polished surfaces. An experimental evaluation was performed using 3-point and 4-point bending fatigue tests at Rr = 0.1 on two sets of notched spec-imens finished by electro-polishing and grinding. The residual stress fields were measured at the notch root of specimens, before and after fatigue tests, by means of the X-ray diffraction technique. It was found a degradation of about 35% for the 4-point bending fatigue limit at 2 106 cycles of the ground spec-imens in comparison to the electro-polished ones. This degradation is associated with a slight relaxation of the grinding residual stresses which remain significant tensile stresses at the stabilized state. While under the 3-point bending test, these residual stresses relax completely and provoke a noticeable increase of the fatigue limit estimated at about 50% in comparison to the 4-point bending fatigue test. The numerical evaluation of residual stress relaxation was carried out by FE analyses of the cyclic hard-ening behaviour of the ground layer. The isotropic and nonlinear kinematic model proposed by Chaboche was used and calibrated for the base material and the ground layer. The results show that residual stres-ses relax to a stabilized state characterized by elastic-shakedown response. This stabilization is occurred after the first cycle of the 4-point bending test corresponding to the higher stress concentration (Kt- 4p = 1.66), while it requires many cycles under the 3-point bending test corresponding to the lower stress concentration (Kt-3p = 1.54). The incorporation of stabilized residual stress values into the Dang Van’s cri-terion has permitted to predict with an acceptable accuracy the fatigue limits under both bending modes.
dc.language.isoen
dc.publisherElsevier
dc.rightsPost-print
dc.subjectGrinding
dc.subjectFatigue
dc.subjectResidual stress relaxation
dc.subjectFE analyses
dc.subjectCyclic hardening
dc.titleEvaluation of residual stress relaxation and its effect on fatigue strength of AISI 316L stainless steel ground surfaces: Experimental and numerical approaches
dc.identifier.doi10.1016/j.ijfatigue.2012.10.008
dc.typdocArticle dans une revue avec comité de lecture
dc.localisationCentre de Paris
dc.subject.halSciences de l'ingénieur: Matériaux
dc.subject.halSciences de l'ingénieur: Mécanique
ensam.audienceInternationale
ensam.page109-121
ensam.journalInternational Journal of Fatigue
ensam.volume48
hal.description.errorBad Request
hal.statusunsent


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