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Experimental study of the impact of geometrical defects on the high cycle fatigue behavior of polycrystalline aluminium with different grain sizes

hal.structure.identifierLaboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
dc.contributor.authorBRACQUART, Benoit
hal.structure.identifierLaboratoire des Arts et Métiers ParisTech d'Angers - Procédés Matériaux Durabilité [LAMPA - PMD]
dc.contributor.authorMAREAU, Charles
hal.structure.identifierInstitut de Mécanique et d'Ingénierie de Bordeaux [I2M]
dc.contributor.authorSAINTIER, Nicolas
hal.structure.identifierLaboratoire des Arts et Métiers ParisTech d'Angers - Procédés Matériaux Durabilité [LAMPA - PMD]
dc.contributor.authorMOREL, Franck
dc.date.accessioned2021-05-14T09:40:53Z
dc.date.available2021-05-14T09:40:53Z
dc.date.issued2018-04
dc.identifier.issn0142-1123
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/76609
dc.description.abstractEnGeometrical defects are known to have a detrimental influence on the high cycle fatigue resistance of metallic alloys, smaller defects being less harmful. In this experimental work, the influence of the defect size on the high cycle fatigue behavior of polycrystalline aluminium with different grain sizes is investigated, to better understand the role of internal length scales. Firstly, different thermomechanical treatments are applied to obtain aluminium samples with either small (100 μm) or large (1000 μm) grains. The samples are used for preparing fatigue specimens, with either small (100 μm) or large (1000 μm) hemispherical defects. Fully reversed stress-controlled fatigue tests are then carried out. According to fatigue test results, surface crack initiation is delayed when the grain size is reduced, while an approximation of the fatigue limit shows that it is not much influenced by the average grain size. The influence of grain size seems to be explained by the role of cyclic plasticity in the crack initiation process. Finally, Electron BackScattered Diffraction (EBSD) maps are collected for specimens with large grains and small defects. Based on this experimental dataset, fatigue crack initiation from a defect is found to be strongly impacted by the crystallographic orientation of the surrounding grain, crack initiation preferably occurring in crystals being favorably oriented for plastic slip.
dc.language.isoen
dc.publisherElsevier
dc.subject.enAluminium
dc.subject.enGrain size
dc.subject.enDefects
dc.subject.enHigh cycle fatigue
dc.subject.enCrack nucleation
dc.title.enExperimental study of the impact of geometrical defects on the high cycle fatigue behavior of polycrystalline aluminium with different grain sizes
dc.typeArticle de revue
dc.subject.halSciences de l'ingénieur [physics]/Mécanique [physics.med-ph]
dc.subject.halSciences de l'ingénieur [physics]/Matériaux
bordeaux.journalInternational Journal of Fatigue
bordeaux.page17-25
bordeaux.hal.laboratoriesInstitut de Mécanique et d’Ingénierie de Bordeaux (I2M) - UMR 5295*
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionBordeaux INP
bordeaux.institutionCNRS
bordeaux.institutionINRAE
bordeaux.institutionArts et Métiers
bordeaux.peerReviewedoui
hal.identifierhal-02294374
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02294374v1
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