Simulation of Low Level Explosives Blast Loadings at Full Scale by Modifications to BRL Dual Shock Tube Facility.
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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A concept is described permitting full scale testing of walls, of 3.7m 12 ft height under simulated explosive blast loadings with pressures about 70 kPa 10 psi, 50ms positive duration. The existing BRL 2.4m 8 ft diameter shock tube with modification was the hardware motivating the inquiry and this hardware is used by way of example in the calculation of numbers and graphs. An enlarged 3.7m test or driven section is added to the 2.4m driver section to accommodate full scale test dimensions. The normal straight shock tube operating cycle is then extended by testing at a location where the reflected expansion waves from the breech overtake and weaken the shock. The resulting pressure loading is a decaying pulse i.e., blast-wave type with determinable duration. A requirement on the loading duration may conversely be used to specify the appropriate tube lengths involved. The methods are described which account for the differences in operation between a straight and an area-changed shock tube, which apparently have not been done before for the subsonic conditions encountered here. Author
- Ammunition and Explosives