Measurement of Pressure from Explosives in a Closed Chamber and the Free Field.
Final rept. Jul 89-Dec 91,
MARYLAND UNIV COLLEGE PARK DEPT OF MECHANICAL ENGINEERING
Pagination or Media Count:
The reflected blast overpressures in a closed vessel and stagnation blast overpressures in the free field environment were measured for Composition B Comp B, LX-14, and Pentolite in three sets of experiments. In the first set of tests the reflected pressures were measured in a 641 chamber volume-to-explosive volume ratio for these explosives in nominally 10-g sizes. A second set of tests consisted of measuring the reflected pressures in a 401 volume ratio chamber for nominally 15-g Comp B and LX-14 explosive charges. For the final set of measurements, the stagnation pressures were recorded for Comp B and LX-14, nominally 900-g sizes in a series of free field experiments conducted in the Colorado School of Mines Experimental Mine at Idaho Springs, CO. The bar pressure gage was the primary sensortransducer combination for performing the measurements for both the closed chamber tests and the free field tests. For the closed vessel tests the bar gages were positioned to measure pressure at the wall of the chamber at several locations relative to the center of the explosive, which also was at the center of the vessel. The bar gages for the free field tests were located around the charge at distances determined by cube root scaling of the explosive weight to the vessel test geometry. Measured blast pressures were compared with those predicted using the JWL equation of state and the HULL hydrocode. Reasonable correspondence was found among the various gage locations and the measured and predicted blast pressures.
- Ammunition and Explosives
- Fluid Mechanics