Reactive metals are routinely added in applications such as propellants and explosives to increase energy density and total energy output. These materials are also becoming useful in warhead casings compared to traditional inert materials because of their ability to enhance weapon output such as peak blast pressure and blast impulse. Aluminum is a good candidate forsuch enhanced blast applications involving structural reactive warhead casings due to its high combustion enthalpy; however, under explosive loading, conventional aluminum casings expend little of the energetic potential storedwithin the material. In addition, aluminum casings are capable of producing large fragments (on the order of mm's) which can be diffi cult to ignite and are accelerated away from the target, lending no additional reactionenhancement to the initial blast. This study aims to determine the most e ffective methods of increasing the reactivity of aluminum warhead casingsthrough modi fication of alloy composition and casing geometry using controlled explosive initiation experiments. The study also explores e ffects ofexplosive end confi nement and impact induced fragment reactions. Transient and quasi-static pressure measurements, high speed imaging, and spatially-varying spectroscopy are performed to determine the e ffectiveness of reactionenhancement for each alloy. In addition, analysis of coarse andfine fragments collected during experiments provides insight into the role of fragmentationsize and distribution on reactivity enhancement of the aluminum materials. Generation of fi ne particles below 10microns during initial fragmentation is believed to play a key role in the casing reactivity enhancement immediatelyfollowing the high explosive detonation.
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Enhancing reactivity of aluminum-based structural energetic materials
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