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Hal
Doctoral thesis . 2004
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Doctoral thesis . 2004
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Doctoral thesis . 2004
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HAL Sorbonne Université
Doctoral thesis . 2004
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Modeling Thin Films

Authors: Zorgati, Hamdi;

Modeling Thin Films

Abstract

Cette thèse est consacrée à la modélisation des films minces courbés du type martensitique, hyperélastiques et ferromagnétiques. L'épaisseur de ces films suivant la direction normale à leur surface moyenne est très petite devant les autres dimensions du film. Dans le cas des films hyperélastiques, on considère que ceux-ci sont fixés à un substrat tout en pouvant s'en décoller. La formulation du problème exclut l'interpénétration du film et du substrat. Les états d'équilibre de ces films sont dans tous les cas décrits par des problèmes de minimisation d'énergie dépendant de la déformation que subit le film ou de la magnétisation dans le cas des films ferromagnétiques. On étudie le comportement de ces énergies ainsi que celui de leurs éventuels minimiseurs, lorsque l'épaisseur du film tend vers zéro à l'aide des outils de la $\Gamma$-convergence et de développement asymptotique formel. On obtient des modèles bidimensionnels où l'énergie limite s'écrit sur une surface courbée de $\mathbb (R)^3$.

This doctoral dissertation is devoted to the modeling of curved thin films made of martensitic, hyperelastic and ferromagnetic materials. The thickness of the films along the normal direction to their midsurface is very small compared with the other dimensions of the films. In the case of hyperelastic films, we consider films that are bounded to a substrate while allowing for debonding. The formulation of the problem prevents film/substrate intepenetration. The equilibrium states of the films are described by energy minimization problems, with energies depending on the film deformation or magnetization in the case of ferromagnetic films. We study the behavior of these energies and their possible minimizers when the thickness of the film tends to zero using the $\Gamma$-convergence arguments and formal asymptotic expansion. We obtain two-dimensional models in which the limiting energy is written on a curved surface of $\mathbb (R)^3$.

Country
France
Keywords

nonlinear elasticity, curved thin films, non interpénétration de la matière., films minces courbés, martensite, [MATH] Mathematics [math], élasticité non linéaire, [SPI.MECA] Engineering Sciences [physics]/Mechanics [physics.med-ph], noninterpenetration of matter, ferromagnétisme, hyperélasticité, formal asymptotic expansion, non interpénétration de la matière, [PHYS.PHYS] Physics [physics]/Physics [physics], $\Gamma$-convergence, hyperelasticity, développement asymptotique formel, [PHYS.COND] Physics [physics]/Condensed Matter [cond-mat]

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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Average
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