Understanding the thermomechanical behavior of a TATB-based explosive via microstructure-level simulations. Part I: Microcracking and viscoelasticity

Hervé Trumel 1 François Rabette 2 François Willot 2 Renald Brenner 3 Emmanuelle Ongari 1 Maxime Biessy 1 Didier Picart 1
1 CEA Le Ripault - CEA Le Ripault
2 CMM - Centre de Morphologie Mathématique
3 DALEMBERT - Institut Jean Le Rond d'Alembert
Abstract : In view of a better understanding of the thermomechanical behavior of pressed explosives, a Fourier-based computational tool is used to perform numerical homogenization and compare predictions to experimental macroscopic properties. This is first done in a purely thermoelastic context on simplified polycrystalline virtual microstructures, then extended to cracked polycrystalline ones. A further extension is proposed, aiming at predicting the nucleation and propagation of (micro)-cracks. Besides, a mean-field (self-consistent) approach is also followed, providing accurate thermoelastic predictions. It is currently being extended to account for linear (non-ageing) viscoelasticity of the binder. The study of irreversible deformation mechanisms of the TATB crystal, in view of their incorporation in the full-field tool, is the subject of the companion paper.
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Hervé Trumel, François Rabette, François Willot, Renald Brenner, Emmanuelle Ongari, et al.. Understanding the thermomechanical behavior of a TATB-based explosive via microstructure-level simulations. Part I: Microcracking and viscoelasticity. Europyro 44th International Pyrotechnics Seminar, Jun 2019, Tours, France. ⟨hal-02312483⟩

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