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Influence de l'état mécanique multiaxial induit par la découpe sur les propriétés d'usage des tôles magnétiques

Abstract : Magnetic silicon-iron alloys are widely used in power engineering. These alloys are processed as 0.2 to 1.0 mm thick laminations, that are punched and stacked to build the magnetic circuit of most electrical machines, but the cutting operation alters the magnetic properties of the material. The goal of this study is the prediction of the magnetic behaviour of such blanked lamination.We first measure the plastic strain field induced by punching, using correlation technics. Then, we use a simplified model to estimate the resulting residual stresses. This analyses points out the existence of long range residual stresses of small magnitude, which affect the global magnetic behaviour of such blanked structures. Accounting for the influence of residual stresses in magneto-mechanic coupled analysis is actually limited because the models available in literature fail to properly restitute the multiaxial nature of this coupling. In order to have reliable experimental data, we have designed a new set-up to measure the magnetic behaviour of electrical steels subjected to biaxial tensile/compressive stresses. The results of our measurements show the weaknesses of the usual models and the complete exploration of magnetic behaviour under biaxial stress is now possible.
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https://tel.archives-ouvertes.fr/tel-00009357
Contributor : Vincent Maurel <>
Submitted on : Wednesday, June 1, 2005 - 12:59:19 AM
Last modification on : Monday, February 15, 2021 - 10:40:15 AM
Long-term archiving on: : Friday, April 2, 2010 - 10:03:06 PM

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  • HAL Id : tel-00009357, version 1

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Vincent Maurel. Influence de l'état mécanique multiaxial induit par la découpe sur les propriétés d'usage des tôles magnétiques. Mécanique [physics.med-ph]. École normale supérieure de Cachan - ENS Cachan, 2002. Français. ⟨tel-00009357⟩

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