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Tack de matériaux modèles

Abstract : We study experimentally and theoretically the separation and rupture mechanisms encountered when a material confined between two parallel plates is put under traction (probe-tack test). This study is conducted on two model systems, chosen for their viscoelastic liquid behaviour: A highly viscous silicone oil and mixtures of a less viscous silicone oil with silica-based nano-particles in various proportions.
The study conducted on the first system shows that, in addition to fingering and cavitation which have been observed with Newtonian liquids, cracks can appear at the material-plate interface. Besides, we present a theoretical model to understand the hierarchy between the rupture mechanisms and describe the traction curve. The good fit of the theoretical model with our experimental data validates the importance of cavitation kinetics in the separation process and allows us to explain the appearance of cracks despite the presence of growing cavities.
The second system comes from elements used in real, industrial adhesives. We have first analysed the influence of the particle volume fraction on rheology. We have observed an evolution of rheological parameters and compared it with that of the adhesion properties. We have then correlated the presence of a second force plateau, routinely observed on real adhesives, with the particle content of the material. Finally, our study leads us to propose an optimal way of rupture for adhesive materials.
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Contributor : Jérémie Teisseire Connect in order to contact the contributor
Submitted on : Saturday, September 29, 2007 - 5:38:57 PM
Last modification on : Tuesday, December 7, 2021 - 11:46:10 AM
Long-term archiving on: : Friday, April 9, 2010 - 4:26:14 PM


  • HAL Id : tel-00175670, version 1



Jérémie Teisseire. Tack de matériaux modèles. Analyse de données, Statistiques et Probabilités []. Université Sciences et Technologies - Bordeaux I, 2006. Français. ⟨tel-00175670⟩



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