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Characterization and simulation of the effect of punching on the high cycle fatigue strength of thin electric steel sheets

Article dans une revue avec comité de lecture
Auteur
DEHMANI, Helmi
467842 Emerson-Leroy Somer
206863 Laboratoire des Arts et Métiers ParisTech d'Angers - Procédés Matériaux Durabilité [LAMPA - PMD]
ccPALIN-LUC, Thierry
ccMAREAU, Charles
206863 Laboratoire des Arts et Métiers ParisTech d'Angers - Procédés Matériaux Durabilité [LAMPA - PMD]
KOECHLIN, Samuel
467842 Emerson-Leroy Somer
ccBRUGGER, Charles

URI
http://hdl.handle.net/10985/17254
DOI
10.1016/j.proeng.2015.12.629
Date
2015
Journal
Procedia Engineering

Résumé

Rotors of electric machines are built from stacks of thin steel sheets. The fabrication process of these components usually involves punching operations that generate defects on the steel sheet edges. In this study, high cycle fatigue tests are performed on punched and polished edges specimens to investigate the effect of the punching process on the fatigue behaviour of these thin sheets. Results show a significant decrease of the fatigue strength for punched specimens. SEM observations of fracture surfaces reveal that crack initiation always occurs on a punching defect. Residual stresses on punched edges are analysed using X-Ray diffraction techniques. High tensile residual stresses along the loading direction are found. Some specimens edges were scanned using 3D topography prior to the fatigue tests. This allows for identifying the real geometry of the most critical defect. Murakami criterion was then evaluated in order to take into account the effect of defects. The best trend of the experimental results is given when residual stresses are taken into account. Local elastic stresses for 3 defects geometries have been calculated using FEA. Crossland fatigue criterion has been evaluated to try accounting for the local stress state around defects. Results show that the assessed fatigue strength is overestimated using this criterion.

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Cette publication figure dans le(s) laboratoire(s) suivant(s)

  • Institut de Mécanique et d’Ingénierie de Bordeaux (I2M)
  • Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA)

Documents liés

Visualiser des documents liés par titre, auteur, créateur et sujet.

  • High Cycle Fatigue Strength of Punched Thin Fe-Si Steel Sheets 
    Article dans une revue avec comité de lecture
    DEHMANI, Helmi; ccPALIN-LUC, Thierry; ccMAREAU, Charles; KOECHLIN, Samuel; ccBRUGGER, Charles (2016)
    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 ...
  • Study of the contribution of different effects induced by the punching process on the high cycle fatigue strength of the M330-35A electrical steel 
    Article dans une revue avec comité de lecture
    DEHMANI, Helmi; ccPALIN-LUC, Thierry; ccMAREAU, Charles; KOECHLIN, Samuel; ccBRUGGER, Charles (ESIS - Elsevier, 2016)
    Because of their improved magnetic properties, Fe-Si alloys are widely used for new electric motor generations. The use of punching process to obtain these components specially affects their mechanical behavior and fatigue ...
  • Experimental study of the impact of punching operations on the high cycle fatigue strength of Fe-Si thin sheets 
    Article dans une revue avec comité de lecture
    DEHMANI, Helmi; ccPALIN-LUC, Thierry; ccMAREAU, Charles; KOECHLIN, Samuel; ccBRUGGER, Charles (Elsevier, 2016)
    In this paper, the impact of punching operations on the high cycle fatigue strength of Fe–Si thin sheets is investigated. High cycle fatigue tests are performed on both punched and polished edge specimens. Results show a ...
  • High cycle fatigue strength assessment methodology considering punching effects 
    Article dans une revue avec comité de lecture
    DEHMANI, Helmi; ccPALIN-LUC, Thierry; ccMAREAU, Charles; KOECHLIN, Samuel; ccBRUGGER, Charles (Elsevier, 2018)
    Since a decrease of the fatigue strength may result from punching operations, this study proposes a methodology for designing punched parts against high cycle fatigue crack initiation. To reach this goal, high cycle fatigue ...
  • A new ultrasonic fatigue testing device for biaxial bending in the gigacycle regime 
    Article dans une revue avec comité de lecture
    ccPALIN-LUC, Thierry; OSMOND, Pierre; BLANC, Michel; ccBRUGGER, Charles (Elsevier, 2017)
    A new fatigue testing device has been developed to test specimens under biaxial loading at 20 kHz. The specimen is a flat smooth disc. It is placed on a torus frame and cyclically loaded in compression at the center of its ...

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