The effect of the addition of small amounts of glass microballoons (GMB) on heterogeneous explosives has been investigated with the aim of understanding mechanisms that lead to the strong reduction of its critical diameter. However, there is no clear identification of the changes on detonation wave propagation and its structural features. To obtain a better understanding of the contribution of GMB as a particular heterogeneity, the detonation failure and the re-initiation of NM/PMMA-GMB mixtures is studied. Corner turning configuration was performed in order to determine the influence of the GMB concentration and size on failure phenomena by observing the trajectories of the divergent shock waves around the corner. The shape of the printed traces on a copper witness plate, coupled with detonation velocity and front curvature measurements, was used to evaluate the evolution of the detonation reaction regime and its cellular structure. The obtained results of printed flow lines show significant changes of the original pattern of the propagation of the detonation wave. The structural colliding and divergent waves were successful identified and explained.
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