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

Abstract : 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.
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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⟩

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