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Micromécanismes et comportement macroscopique d'un élastomère fortement chargé

Abstract : The main goal is to study the mechanical behaviour of the propellant, an energetic material used in propulsion. In order to model correctly this mechanical behaviour, it seems necessary to understand the relationships between the physics of the propellant (highly-filled elastomer) and its macroscopic properties. An experimental and numerical multi-scale approach is emphasized in this work. The design of experiment method is applied to formulate 22 materials. The microstructure of these materials is characterized by physico-chemical tests. Numerical modeling of the strained microstructure enables us to examine the heterogeneity of the mechanical fields. Nuclear magnetic resonance tests are performed for the analysis of the segmental mobility evolution of the polymer chains as the material is strained. At a macroscopic scale, dynamic mechanical analysis (DMA) tests are performed. The influence of prestrain is measured at room temperature and as a function of temperature. A strong nonlinearity is observed in the material behaviour and micromechanisms are suggested. Finally, the isotropy of the micromechanisms is analysed using multiaxially prestrained DMA tests.
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https://pastel.archives-ouvertes.fr/tel-00552234
Contributor : Aurélie Azoug <>
Submitted on : Wednesday, January 5, 2011 - 5:20:21 PM
Last modification on : Thursday, September 24, 2020 - 4:00:22 PM
Long-term archiving on: : Wednesday, April 6, 2011 - 3:22:20 AM

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  • HAL Id : tel-00552234, version 1

Citation

Aurélie Azoug. Micromécanismes et comportement macroscopique d'un élastomère fortement chargé. Mécanique [physics.med-ph]. Ecole Polytechnique X, 2010. Français. ⟨tel-00552234⟩

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