A fast Fourier transform micromechanical upscaling method for the study of the thermal expansion of a TATB-based pressed explosive

Andrey Ambos (1) , Hervé Trumel (2) , François Willot (1) , Dominique Jeulin (1) , Maxime Biessy (2)

1 CMM - Centre de Morphologie Mathématique
2 CEA Le Ripault - CEA Le Ripault

This paper presents the first phase of development of a multiscale numerical method oper-ating at the microstructureal level for a TATB-based pressed plastic-bonded explosive. It uses a virtual model of microstructure mimicking the grain size distribution of the actual material, and a Fourier-based numerical scheme. At present, the method works with sim-plified microstructure and linear anisotropic thermoelastic behavior for the constituents. Neglecting the inter-granular binder leads to fairly overestimated values for isotropic elas-tic moduli and volumetric coefficient of thermal expansion. A first attempt to include the binder yielded much more realistic predictions for elastic moduli, but not for the volumet-ric thermal expansion coefficient. The origin of this discrepancy is thought to lie in the behavior of constituents.

Domaines: Mécanique des matériaux [physics.class-ph]

Andrey Ambos, Hervé Trumel, François Willot, Dominique Jeulin, Maxime Biessy. A fast Fourier transform micromechanical upscaling method for the study of the thermal expansion of a TATB-based pressed explosive. 15th International Detonation Symposium, Jul 2014, San Francisco, United States. ⟨hal-01097110⟩