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Etude micromécanique du lien entre endommagement local et comportement macroscopique de propergols solides

Abstract : The goal of this present project is the development of numerical tools for simulating damage of solid propellants, which are used for anaerobic propulsion. It should allow identifying which properties disturb their behavior. To study the effect of energetic particles shapes, 3D microstructures are generated with a random dispersion of monosized spheres or polyhedra at high volume fraction (55%). In case of spheres, the elastic properties of the representative volume elements (RVE) are confronted with an analytical model and experimental characterizations of model composites, with a remarkable coherence of the three approaches. Then, the linear behavior of REV filled with polyhedra is compared to the one in case of spheres, highlighting only a limited effect of particles shapes. Damage of those materials being mostly due to matrix/filler debounding, a bilinear cohesive zone model with a viscous regularization and posting of interfaces damage state is implemented. The first order influence of the cohesive zone parameters either on the mechanical response or on the local damage is demonstrated. If convergence troubles prevent any quantitative confrontation with experimental data, their specific trends are well reproduced at either the particles or the global scales. A parameter study highlights also the impact of each cohesive zone parameter on the global behavior. Study of the damaged behavior, depending on particles shape, leads again to a second order impact. Finally, analyses of quasi-propellants, representative of common propellants, are proposed. Following the industrial characterization process, the interfaces properties are identified qualitatively based on the trends of the simulations. This analysis is completed by non-conventional characterization techniques to validate its coherence and to offer exhaustive information on the adhesives properties.
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Submitted on : Tuesday, October 20, 2020 - 4:05:14 PM
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  • HAL Id : tel-02972773, version 1

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Foucault de Francqueville. Etude micromécanique du lien entre endommagement local et comportement macroscopique de propergols solides. Mécanique des matériaux [physics.class-ph]. Institut Polytechnique de Paris, 2019. Français. ⟨NNT : 2019IPPAX004⟩. ⟨tel-02972773⟩

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