Comportement thermo-visco-élastique des composites CMO – De la statique à la dynamique grande vitesse

Abstract : Organic matrix composite materials are more and more used in the transportation industry to design strutural components. In order to reach an optimal design, improvements in the understanding and the modelling of the behaviour of these materials under various strain rates and temperatures conditions are required.Therefore, a campaign of various mechanical tests has been performed on the T700GC/M21 organic matrix composite laminate in this work. On one hand, dynamic tests have been performed using hydraulic jacks, as well as creep tests, to characterise the material strain rate dependency. On the other hand, low temperatures and DMA tests have been performed to exhibit the temperature effect.Experimental results have been used to physically justify a bi-spectral visco-elactic model which describes the strain rate dependency of T700GC/M21 on a large range of strain rates. Introducing an Arrhenius like law for the viscous mechanisms, the temperature dependency has also been taken into account. The obtained thermo-visco-elastic model finally describes the behaviour of the T700GC/M21 laminate on a large range of strain rates and temperatures
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Julien Berthe. Comportement thermo-visco-élastique des composites CMO – De la statique à la dynamique grande vitesse. Autre. Ecole Centrale de Lille, 2013. Français. ⟨NNT : 2013ECLI0016⟩. ⟨tel-00934876⟩

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