Etude de la relation microstructure/propriétés mécaniques jusqu’à rupture des propergols composites : Caractérisation expérimentale et modélisation micromécanique par éléments finis

Abstract : This work aims at understanding the relationship between solid propellants particles volume fraction, particles size distribution, binder mechanical properties and binder/particles bonding with the mechanical behavior up to failure of these materials. Finite elements analyses on 2D microstructures are performed in order to qualitatively characterize the microstructure evolution throughout uniaxial tensile loading at small strain rate. These simulations account for the binder/particles debonding with a cohesive zone model and implement an original failure criterion. Simulation and experimental results are consistent. Besides, a quantitative comparison between simulations on 3D microstructures and experimental data is drawn in order to validate the above qualitative results. It is performed on a model composite and compares both the mechanical behavior and the volume variations. At last, the propellant failure during a peeling test of the liner/propellant structure is studied experimentally.
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Paul-Aymé Toulemonde. Etude de la relation microstructure/propriétés mécaniques jusqu’à rupture des propergols composites : Caractérisation expérimentale et modélisation micromécanique par éléments finis. Mécanique des matériaux [physics.class-ph]. Ecole nationale supérieure d'arts et métiers - ENSAM, 2016. Français. ⟨NNT : 2016ENAM0038⟩. ⟨tel-01511053⟩

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