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Microstructure-based study of the crack initaition mechanisms in pure copper under high cycle multiaxial fatigue loading conditions

hal.structure.identifierInstitut de Mécanique et d'Ingénierie de Bordeaux [I2M]
dc.contributor.authorAGBESSI, Komban
hal.structure.identifierInstitut de Mécanique et d'Ingénierie de Bordeaux [I2M]
dc.contributor.authorSAINTIER, Nicolas
hal.structure.identifierInstitut de Mécanique et d'Ingénierie de Bordeaux [I2M]
dc.contributor.authorPALIN LUC, Thierry
IDREF: 136498752
dc.date.accessioned2021-05-14T09:41:15Z
dc.date.available2021-05-14T09:41:15Z
dc.date.issued2016-06
dc.identifier.issn2452-3216
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/76639
dc.description.abstractEnThis paper aims to contribute in understanding the fatigue crack initiation mechanisms in metallic materials under high cycle multiaxial fatigue loadings. It addresses proportional and non-proportional multiaxial loading conditions with the analysis and observation of the cyclic plasticity development (mainly persistent slip band) until crack initiation (especially short cracks) on a pure oxygen-free high conductivity (OFHC) polycristalline copper. Observation and analysis techniques are based mainly on optical microscopy and scanning electron microscopy (SEM). It has been observed that the plastic slip multiplicity in grains seems more important for multiaxial loadings at a stress level corresponding to the same median fatigue strength at 106 cycles of the material.A multiaxial loading induces an additional multiplicity of the plastic slip in grains compared to uniaxial loading condition. For all the loading conditions investigated, although most of the grains exhibits single slip activated, analysis of the preferential crack initiation sites and modes show a higher probability of intragranular microcrack initiation in the multiple slip grains (with more than two slip systems activated). Most multiple slip grains and higher probability of crack initiation in these grains were observed especially for non-proportional multiaxial loadings. Finally, the effects of the biaxiality ratio and the phase shift on the fatigue crack initiation was highlighted.
dc.language.isoen
dc.publisherESIS - Elsevier
dc.subjectHigh cycle multiaxial fatigue
dc.subjectpersistent slip band
dc.subjectcyclic plasticity
dc.subjectMultiple slip
dc.subjectIntragramular crack initiation
dc.title.enMicrostructure-based study of the crack initaition mechanisms in pure copper under high cycle multiaxial fatigue loading conditions
dc.typeArticle de revue
dc.identifier.doi10.1016/j.prostr.2016.06.400
dc.subject.halPhysique [physics]
bordeaux.journalProcedia Structural Integrity
bordeaux.page3210-3217
bordeaux.hal.laboratoriesInstitut de Mécanique et d’Ingénierie de Bordeaux (I2M) - UMR 5295*
bordeaux.issue2
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionBordeaux INP
bordeaux.institutionCNRS
bordeaux.institutionINRAE
bordeaux.institutionArts et Métiers
bordeaux.peerReviewedoui
hal.identifierhal-02281694
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02281694v1
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