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Poster De Conférence Année : 2023

Assessment of ternary pyrotechnic compositions thermal conductivities using binary and multi-scale model

Résumé

Thermal conductivity is a key parameter to study combustion velocity of pyrotechnic compositions. However, it is difficult to obtain it for mixtures of granular materials. This work aims at presenting a methodology using existing models to assess thermal conductivity of ternary pyrotechnic compositions. These pyrotechnic compositions are composed of an oxidiser, a metallic reducer, and an energetic molecule used both for energy supply and mechanical binding. These components are respectively strontium peroxide (SrO2), magnesium (Mg), and 2,4-Dinitroanisole (DNAN). Several ternary pyrotechnic compositions were designed and produced at Nexter Munitions facility and characterized in PRISME Laboratory in Bourges with different reducer/oxidiser ratios and binder contents. Thermal conductivities were obtained using an existing model proposed by Hashin & Strikmann, which is a bi-component model. This model was coupled to a multi-scale bi-component deconstruction of pyrotechnic composition grains to obtain thermal conductivity of ternary composition. The upper and lower boundaries given by Hashin & Strikmann model applied at each scale gave several possibilities for the thermal conductivity evolution. Validation of correct evolution was performed using cellular automaton modelling, in collaboration with a wider project on energetic materials, which is the industrial chair ACXEME. It was observed that internal porosity exhibits a key role in transfer through the porous media.
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hal-04501405 , version 1 (12-03-2024)

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  • HAL Id : hal-04501405 , version 1

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Charles Rosères, Léo Courty, Christophe Boulnois, Philippe Gillard. Assessment of ternary pyrotechnic compositions thermal conductivities using binary and multi-scale model. 46th International Pyrotechnics Society Seminar (Europyro 2023), 2023, Saint Malo, France. ⟨hal-04501405⟩
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