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A SIMPLE MECHANICAL METHOD FOR MEASURING THE REFLECTED IMPULSE OF AIR BLAST WAVES
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
A mechanical method is described for measuring the impulse imparted to a flat rigid surface by the reflection at 90 deg. or normal incidence of an air blast wave. The method consists of measuring the velocity at which a cylindrical plug of known mass is projected from a hole in a large rigid surface by a normally incident blast wave and computing the impulse from Newtons 2nd law. Experimental results were obtained for spherical Pentolite explosive charges ranging in weight from 14 to 2 lbs and scaled distances from 0.5 to 2.5 ftcu.rt. lb.. Results of 154 trials are tabulated and also presented graphically. In addition, a comparison is made with data obtained with piezoelectric gages.
Approved for public release; distribution is unlimited. Document partially illegible.