IGNITION OF HMX-BASED PBX SUBMITTED TO IMPACT: STRAIN LOCALIZATION AND BOUNDARY CONDITIONS.

HMX-based high explosive devices may unintentionally ignite and transit to deflagration or detonation during mechanical loadings such as low velocity impact. We focus our attention to ignition. The Browning and Scammon criterion is used in this study. A concrete like constitutive law is derived, with an up-to-date experimental characterization. These models have been implemented in the Abaqus/Explicit finite element code. Numerical simulations are compared to go/no go impact experiments in order to calibrate the threshold. This paper is about the influence of two major assumptions: (1) the behavior at finite strains and (2) the boundary conditions. This paper shows that ignition threshold evolves significantly due to these assumptions, leading to erroneous predictions. [ABSTRACT FROM AUTHOR]