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Etude théorique et expérimentale de l'amorçage par choc et de la détonation de compositions énergétiques intégrant des additifs oxydants et métalliques réactifs.

Abstract : This thesis is focused on the shock to detonation transition of aluminized plastic bonded high explosives. An experimental approach and a theoretical one have been carried out to deal with the shock ignition issue of nitramines (RDX, HMX) based high explosives with HTPB binder.The bibliographic study reveals a cruel lack of experimental data and shock to detonation transition models. Thus, a series of experiments was conducted in order to have available data for the development of a kinetic model.These experiments are based on plane sustained and unsustained shock test, usually called Pop-Plot test. The analysis of the data provided requires the development of a new posttreatment method using a global optimization algorithm. In addition, a new experimental device was developed to study the shock to detonation transition in a spherical divergent geometry which is much more representative of detonator priming. This experimental study requires the development and the use of new metrological devices such as fiber Bragg grating and radio-interferometer.Thanks to a deep analysis of the experimental results and the comparison with a non-aluminized high explosive, a desensitization effect of the aluminum particles was provided. A study of the transition at the mesoscale using multiphasic Euler equations was carried out to deal with the mechanical and thermal equilibrium between the particles and the flow surrounded them. An explanation of the shock to detonation transition of aluminized high explosive phenomenology is proposed.
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Thomas Elia. Etude théorique et expérimentale de l'amorçage par choc et de la détonation de compositions énergétiques intégrant des additifs oxydants et métalliques réactifs.. Génie des procédés. Institut Polytechnique de Paris, 2019. Français. ⟨NNT : 2019IPPAE001⟩. ⟨tel-02503759⟩

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