Development of a Low-Density Ammonium Nitrate/Fuel Oil Explosive and Modeling of Its Detonation Properties
Final rept. 25 Oct 1971-30 Dec 1972
PHYSICS INTERNATIONAL CO SAN LEANDRO CA
Pagination or Media Count:
A low-density ammonium nitratefuel oil ANFO explosive was developed by diluting the normal density explosive with low-density polystyrene beads. Stable detonations were achieved in mixtures having densities over the range 0.5 to 0.9 gmcc. The detonation velocity was found to decrease approximately linearly with decreasing density. The explosive was found to have a long reaction time and required large charges with propagation distances on the order of 100 to 150 cm to establish a steady-state detonation. The buildup of the detonation wave to its steady-state velocity was successfully modeled using a grain-burning reaction rate theory with a reaction time constant of 100 microsec. A mixture having a density of 0.75 gmcc was selected as the explosive for the MINE THROW II Event and a mathematical model of its detonation properties was developed for use in the charge design calculations.