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

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dc.contributor.author DEHMANI, Helmi
ensam.hal.laboratories
  164351 Institut de Mécanique et d'Ingénierie de Bordeaux [I2M]
dc.contributor.author BRUGGER, Charles
ensam.hal.laboratories
  164351 Institut de Mécanique et d'Ingénierie de Bordeaux [I2M]
dc.contributor.author PALIN-LUC, Thierry
ensam.hal.laboratories
  164351 Institut de Mécanique et d'Ingénierie de Bordeaux [I2M]
dc.contributor.author MAREAU, Charles
ensam.hal.laboratories
  206863 Laboratoire des Arts et Métiers ParisTech d'Angers - Procédés Matériaux Durabilité [LAMPA - PMD]
dc.contributor.author KOECHLIN, Samuel
ensam.hal.laboratories
  467842 Emerson-Leroy Somer
dc.date.accessioned 2016-09-28T15:13:49Z
dc.date.available 2017-01-01T01:01:38Z
dc.date.issued 2016
dc.date.submitted 2016-09-17T12:49:50Z
dc.identifier.uri http://hdl.handle.net/10985/11225
dc.description.abstract Some 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. en
dc.language.iso en
dc.publisher ASTM
dc.rights Post-print
dc.subject Fe–Si steel sheet en
dc.subject High Cycle Fatigue en
dc.subject Punching effect en
dc.subject Temperature effect en
dc.subject residual stress en
dc.subject defect en
dc.title High Cycle Fatigue Strength of Punched Thin Fe-Si Steel Sheets en
ensam.hal.id hal-01375905 *
ensam.hal.status accept *
ensam.embargo.terms 2017-01-01
dc.identifier.doi 10.1520/MPC20150063
dc.typdoc Articles dans des revues avec comité de lecture
dc.localisation Centre de Angers
dc.localisation Centre de Bordeaux-Talence
dc.subject.hal Sciences de l'ingénieur: Mécanique
dc.subject.hal Sciences de l'ingénieur: Mécanique: Génie mécanique
dc.subject.hal Sciences de l'ingénieur: Mécanique: Mécanique des matériaux
dc.subject.hal Sciences de l'ingénieur: Mécanique: Mécanique des structures
ensam.audience Internationale
ensam.page 1-15
ensam.journal Materials Performance and Characterization
ensam.volume 5
ensam.issue 3
ensam.peerReviewing Oui

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