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<p>The continued development of a low-cost and safe method for neutralizing explosive threats is reported. The  concept depends on the use of pure nitromethane in a totally encased lightweight plastic shaped charge, and the in  situ injection of a minute quantity of diethylenetriamine just prior to employment. Penetration and impact initiation  capabilities of a baseline charge, as well as function reliability were previously demonstrated.  The jet from a previously developed brass encased baseline charge is fully characterized from flash  radiography, and important technical issues relative to computational prediction are resolved. A new precision 42  degree lined charge is shown to outperform the baseline by as much as 6 to 74 percent over the standoff range  studied. These improvements allowed for the incorporation of a Teflon body and a bi-material Teflon/copper liner in  conformance with the goal of total encasement of the nitromethane.  Relative differences in jetting characteristics and quantitative assessments of the penetration capability of the  new design and small performance decrements resulting from the plastic substitutions are reported
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<br>Subjects: Cost; Technology; Engineering</div>
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Gerace, David M.</div>
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