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High Cycle Fatigue Strength of Punched Thin Fe-Si Steel Sheets

hal.structure.identifierInstitut de Mécanique et d'Ingénierie de Bordeaux [I2M]
dc.contributor.authorDEHMANI, Helmi
hal.structure.identifierInstitut de Mécanique et d'Ingénierie de Bordeaux [I2M]
dc.contributor.authorBRUGGER, Charles
hal.structure.identifierInstitut de Mécanique et d'Ingénierie de Bordeaux [I2M]
dc.contributor.authorPALIN LUC, Thierry
IDREF: 136498752
hal.structure.identifierLaboratoire des Arts et Métiers ParisTech d'Angers - Procédés Matériaux Durabilité [LAMPA - PMD]
dc.contributor.authorMAREAU, Charles
hal.structure.identifierEmerson-Leroy Somer
dc.contributor.authorKOECHLIN, Samuel
dc.date.accessioned2021-05-14T09:53:06Z
dc.date.available2021-05-14T09:53:06Z
dc.date.issued2016
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/77498
dc.description.abstractEnSome parts of electrical machines are built from stacks of thin steel sheets, for which the coarse grain microstructure allows for minimizing magnetic losses. The fabrication process of these parts usually involves punching operations that generate important defects on the edges. Since these alterations may result in a degradation of the fatigue strength, this study aims at elaborating on a fatigue design strategy for such punched parts. To reach this objective, high cycle fatigue tests are performed on different specimens with either punched or polished edges. The results show a significant decrease of the fatigue strength for punched specimens. Scanning electron microscope observations of specimen facture surfaces reveal that defects on punched edges are at the origin of the fatigue cracks. The influence of temperature is also investigated. Fatigue tests are performed at ambient temperature (20°C) and at 180°C. According to the experimental results, no significant influence on the median fatigue strength is observed. Since crack initiation always occur on the edges, additional investigations are performed to characterize how edges are altered by punching operations. Residual stresses are determined on punched edges using x-ray diffraction techniques. As a consequence of punching, important tensile residual stresses exist along the loading direction. In association with the stress concentration caused by geometrical defects, residual stresses promote crack initiation and fast crack propagation. For a better understanding of crack initiation, edge geometries are scanned with a 3D optical profilometer, allowing us to identify the critical defect. It is found that the typical defect size is comparable to the grain size.
dc.language.isoen
dc.subject.enFe–Si steel sheet
dc.subject.enHigh Cycle Fatigue
dc.subject.enPunching effect
dc.subject.enTemperature effect
dc.subject.enresidual stress
dc.subject.endefect
dc.title.enHigh Cycle Fatigue Strength of Punched Thin Fe-Si Steel Sheets
dc.typeArticle de revue
dc.identifier.doi10.1520/MPC20150063
dc.subject.halSciences de l'ingénieur [physics]/Mécanique [physics.med-ph]
dc.subject.halSciences de l'ingénieur [physics]/Mécanique [physics.med-ph]/Génie mécanique [physics.class-ph]
dc.subject.halSciences de l'ingénieur [physics]/Mécanique [physics.med-ph]/Mécanique des matériaux [physics.class-ph]
dc.subject.halSciences de l'ingénieur [physics]/Mécanique [physics.med-ph]/Mécanique des structures [physics.class-ph]
bordeaux.journalMaterials Performance and Characterization
bordeaux.page1-15
bordeaux.volume5
bordeaux.hal.laboratoriesInstitut de Mécanique et d’Ingénierie de Bordeaux (I2M) - UMR 5295*
bordeaux.issue3
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionBordeaux INP
bordeaux.institutionCNRS
bordeaux.institutionINRAE
bordeaux.institutionArts et Métiers
bordeaux.peerReviewedoui
hal.identifierhal-01375905
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01375905v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Materials%20Performance%20and%20Characterization&rft.date=2016&rft.volume=5&rft.issue=3&rft.spage=1-15&rft.epage=1-15&rft.au=DEHMANI,%20Helmi&BRUGGER,%20Charles&PALIN%20LUC,%20Thierry&MAREAU,%20Charles&KOECHLIN,%20Samuel&rft.genre=article


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