Three kinds of cylindrical charges based on RDX with different ratios of aluminum to oxygen (denote the molar mass ration of two types atoms, expressed as Al/O ratio) were tested through underwater explosion. Attenuation law of shock wave peak pressure versus transmission distance at close-field underwater explosion was resolved by high-speed scanning. The effects of Al/O ratio on initial shock wave peak pressure and attenuation were analyzed. Results show that the initial Shockwave peak pressure achieves 18.95 GPa, 13.66 GPa and 8.35 GPa respectively when the Al/O ratios are 0, 0.4 and 0.7. It is evident that the ratio of aluminum to oxidant in explosive has great effect on shock pressure at close-field. The more aluminum is included, the fewer RDX exist, which would affect the detonation performance and reduce the initial shock peak pressure.
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