Effects of Charge Shape and Composition on Blast Environment
Final rept. Mar 1972-Sep 1974
CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CA
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Blast pressures were obtained from surface bursts of hemispherical, spherical, and cylindrical composition B explosive and from encased RDX slurry charges. Charge weights varied from 0.50 to 3.7 pounds. Pressure measurements, taken between 2 and 50 feet from the charge, varied from less than 1 psi to over 1,000 psi. The pressure-time records were evaluated for peak pressure, impulse, and positive-phase duration. The effects of charge shape and composition were of primary importance, but surface hardness and slight charge elevation effects were also investigated. Peak-pressure and peak-scaled unit impulse equivalencies by weight of TNT hemispherical surface bursts are calculated for composition B spheres and cylinders and for the RDX slurry charges. Test results indicate that the blast environment from composition B depends more on the shape of the charge than on its chemical difference from the TNT standard. The composition B equivalencies determined in this study might be more properly labeled as shape factors which could be applied to any high explosive.
- Ammunition and Explosives