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

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.

Domaines: Matériaux

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⟩