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Vibrations et Micromécanique de Matériaux Amorphes Modèles

Abstract : Amorphous solids present peculiar mechanical and vibrational properties. Although not having any long range order, they show an higher plastic threshold and weaker shear modulus than corresponding crystals. Contrary to the response in terms of dislocations of crystals, the irreversible response of sheared amorphous solids is strongly localized (shear bands). We present recent numerical results on simple model amorphous solids
and demonstrate that the observed excess of vibrational modes in the Terahertz region, the so-called "Boson Peak", is related to the non-affine response of amorphous solids under external load, i.e. to the breakdown of classical elasticity continuum theory at small wavelengths. The relevance of the non-affine displacements on plastic deformation and yield is discussed.
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https://tel.archives-ouvertes.fr/tel-00135515
Contributor : Fabien Léonforte <>
Submitted on : Thursday, March 8, 2007 - 10:21:38 AM
Last modification on : Thursday, October 15, 2020 - 9:00:03 AM
Long-term archiving on: : Friday, September 21, 2012 - 12:36:30 PM

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  • HAL Id : tel-00135515, version 1

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Fabien Léonforte. Vibrations et Micromécanique de Matériaux Amorphes Modèles. Analyse de données, Statistiques et Probabilités [physics.data-an]. Université Claude Bernard - Lyon I, 2005. Français. ⟨tel-00135515⟩

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