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

Article dans une revue avec comité de lecture
Author
DEHMANI, Helmi
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
467842 Emerson-Leroy Somer
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/10985/11225
DOI
10.1520/MPC20150063
Date
2016
Journal
Materials Performance and Characterization

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.

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  • Institut de Mécanique et d’Ingénierie de Bordeaux (I2M)
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