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High cycle fatigue strength assessment methodology considering punching effects

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

URI
http://hdl.handle.net/10985/17253
DOI
10.1016/j.proeng.2018.02.065
Date
2018
Journal
Procedia Engineering

Résumé

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 tests are performed on different specimens configurations with either punched or polished edges. Due to punching effects, the fatigue strength of punched specimens is significantly decreased. Fracture surfaces observations reveal that crack initiation occurs always on a punch defect. Additional investigations are combined to characterize how the edges are altered by the punching operations. High tensile residual stress levels along the loading direction are quantified using X-Ray diffraction techniques. Furthermore, micro-hardness measurements and X-Ray diffraction results reveals a strong hardness gradient due to punching operation. For a better understanding of crack initiation mechanisms, the edge geometries have been scanned with 3D optical microscopy, allowing us to identify the most critical defect (and its real geometry) by comparing the edges before and after fatigue failure. Finally, FEA are performed on identified defects. A non-local high cycle multiaxial fatigue strength criterion has been used as post-processing of FEA to take into account the effect on the HCF strength of defects and the strong stress-strain gradients around them.

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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 ...
  • 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
    DEHMANI, Helmi; ccPALIN-LUC, Thierry; ccMAREAU, Charles; KOECHLIN, Samuel; ccBRUGGER, Charles (Elsevier, 2015)
    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 ...
  • 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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