Demonstration of tailored impact to achieve blast-like loading

Investigation of blast loading using mechanical devices is a viable alternative to field testing with live explosives. Using impact to simulate blast-like loads has been shown to generate repeatable loading similar to field testing with live explosives, and impact loading has the advantage of high speed camera data that is not obscured by a fireball. It is demonstrated that the UCSD Blast Simulator has the capability of generating blast-like loading on civil structures by using hydraulic rams, in which the loading is tailored in two ways. First, the careful regulation of the hydraulic pressures and valve opening/closing allows the impact to be adjusted so that the peak loads and duration of the load can be controlled. Secondly, the presence of a polyurethane material at the front of hydraulic rams determines the shape of the loading that is applied to the test specimens. These two key characteristics of the Blast Simulator, which govern the pulse duration, shape, and impulse associated with impact, are referred to as the punch and the programmer. The experimental data processing methodology relating to the punch of the hydraulic rams is described, along with a brief description of the rubber programmer material. The results of a major Blast Simulator test are shown, as well as the description of a method for incorporating all relevant aspects of the punch and the programmer into a corresponding high fidelity computer simulation. Finally, the results of this Blast Simulator test are compared to a corresponding field test using live explosives in order to demonstrate the capability of the Blast Simulator to generate blast-like loading. (C) 2014 Elsevier Ltd. All rights reserved.