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High-cycle fatigue behavior of a laser powder bed fusion additive manufactured Ti-6Al-4V titanium: effect of pores and tested volume size

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hal.structure.identifierLaboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
dc.contributor.authorPESSARD, Etienne
hal.structure.identifierLaboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
dc.contributor.authorLAVIALLE, Manon
hal.structure.identifierLaboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
dc.contributor.authorLAHEURTE, Pascal
hal.structure.identifierLaboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
dc.contributor.authorDIDIER, Paul
hal.structure.identifierÉcole Polytechnique de Montréal [EPM]
dc.contributor.authorBROCHU, Myriam
dc.date.accessioned2021-05-14T09:30:09Z
dc.date.available2021-05-14T09:30:09Z
dc.date.issued2021
dc.identifier.issn0142-1123
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/75788
dc.description.abstractEnThis work is focused on the effect of natural defect on the fatigue resistance of a laser powder bed fusion additively manufactured Ti-6Al-4V titanium. To reveal the fatigue strength variability and its sensitivity to the defect size, push-pull fatigue tests have been undertaken on specimens with different sizes of highly loaded volume of material. In order to easily vary the size of the highly loaded volume, specimens containing different numbers of surface hemispherical shape holes of 600 μm in diameter have been tested. This method also allowed to test small volume which triggered crack initiation from microstructural features.The fatigue damage mechanisms observed and the average natural defect size measured on the failure surfaces depend on the size of the highly stressed region. A higher fatigue strength is observed for smaller stressed volumes and defect free regions. To reduce the impact lack-of-fusion on fatigue and increase the probability of triggering crack initiation from a microstructural feature, the specimens were built in the horizontal direction. For specimens where fatigue cracks initiated at natural discontinuities, the results reported in a Kitagawa-Takahashi diagram revealed a critical defect size (√area ) in the range of 30 μm. In addition, a probabilistic approach based on the weakest link theory is proposed. The model describes a probabilistic Kitagawa-Takahashi diagram accounting for the size of both the highly stressed volume and the natural defect.
dc.language.isoen
dc.publisherElsevier
dc.subject.enAdditive manufacturing
dc.subject.enHigh cycle fatigue
dc.subject.enTi-6Al-4V
dc.subject.enTitanium porosity
dc.subject.enSize effect
dc.subject.enPowder bed fusion
dc.subject.enKitagawa-Takahashi diagram
dc.title.enHigh-cycle fatigue behavior of a laser powder bed fusion additive manufactured Ti-6Al-4V titanium: effect of pores and tested volume size
dc.typeArticle de revue
dc.identifier.doi10.1016/j.ijfatigue.2021.106206
dc.subject.halSciences de l'ingénieur [physics]/Mécanique [physics.med-ph]/Mécanique des matériaux [physics.class-ph]
bordeaux.journalInternational Journal of Fatigue
bordeaux.page106206
bordeaux.volume149
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-03199338
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03199338v1
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