Abstract
The weak shock loading plays the leading role in the unexpected explosion accidents of condensed-phase explosives. Under the weak shock loading conditions, the shear localization is the main factor affecting the formation of hot spots. When a planar stress wave crosses over a pore in the polymeric binder of the polymer bonded explosive (called intergranular pore), the shear localization comes out around the pore, which may induce potential hot spots formation in the polymeric binder and cause the chemical reaction of the nearby energetic crystal granules. In the present work, a novel experiment system consisting of time-resolved shadowgraph and laser-driven compressions was used to record the interactions between the planar stress wave and the intergranular pore. Then, a two-dimensional numerical simulation was performed to calculate the shear localization and the temperature rise around the intergranular pore. The simulation results were in good agreement with the experiments. Finally, the locations of the potential hot spots were determined, and the variations of the locations with the impulse width of incident stress wave were discussed.
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