Shape effect in the magnetostriction of ferromagnetic composite |
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Authors: | G. Diguet E. Beaugnon |
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Affiliation: | a CNRS-CRETA, 25 avenue des martyrs, 38042 Grenoble, France b MATEIS, UMR5510, CNRS, INSA-Lyon, 7 avenue Jean Capelle, 69621 Villeurbanne, France |
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Abstract: | The magnetostriction of composite consisting of a soft matrix, non-magnetic, randomly filled by ferromagnetic particles is measured. The measured elongation on cylinder-shaped samples displays shape dependence. A model based on the demagnetizing field and the effective Young’s modulus is provided. Both calculation and measurement show a positive magnetostriction with larger values as the samples are flatter. The model is derived to have the behavior of the elongation as a function of the filling factor. An expression of the optimal filling factor, providing a maximal strain, is also expressed. |
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Keywords: | Shape effect Ferromagnetic particle Elastomer Demagnetizing field Filling factor Composite Young&rsquo s modulus |
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