Accession Number : ADA315141

Title :   Numerical Simulation of Projectile Impact Experiments Using The Forest Fire Reaction Rate Model,

Corporate Author : DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)

Personal Author(s) : Borg, Rodney A. ; Jones, David A.

PDF Url : ADA315141

Report Date : JUL 1996

Pagination or Media Count : 34

Abstract : We describe the development of a two-dimensional multimaterial reactive Eulerian hydrocode to model the detonation of condensed phase explosives, and use the code to model the projectile impact initiation of explosives. The code solves the Euler equations for the conservation of mass, momentum, and energy for an inviscid, compressible fluid using the Flux Corrected Transport algorithm. The condensed phase materials are modelled using a Mie-Gruneisen equation of state, while the Becker-Kistiakowsky-Wilson equation of state is used to describe the gaseous detonation products. The Forest Fire reaction rate model is used to describe the rate of energy release from the explosive, and a modified Young's algorithm is used to maintain a sharp interface between different materials on the computational mesh. The code was used to simulate the impact of a cylindrical steel projectile against Composition B explosive, and the threshold velocity for the onset of detonation was found to be dependent on the diameter of the projectile. Our computed results are in good agreement with experimental values, as well as with results obtained from Mader's 2DE reactive hydrocode. The work described here will provide the ADF with an improved methodology to assess bullet/fragment hazards, and assist in the development of an Insensitive Munitions capability.

Descriptors :   *MATHEMATICAL MODELS, *PROJECTILES, *IMPACT TESTS, *CODING, *EXPLOSIVES INITIATORS, *FOREST FIRES, VELOCITY, ALGORITHMS, COMPUTATIONS, HAZARDS, SMALL ARMS AMMUNITION, INTERFACES, TWO DIMENSIONAL, FLUX(RATE), MASS, THRESHOLD EFFECTS, NUMERICAL ANALYSIS, MODULUS OF ELASTICITY, RATES, ENERGY TRANSFER, EXPLOSIVES, STEEL, GASES, MESH, COMPRESSIBLE FLOW, CYLINDRICAL BODIES, TRANSPORT, FLUIDS, EULER EQUATIONS, CONSERVATION, AUSTRALIA, INVISCID FLOW, FRAGMENTS, INSENSITIVE EXPLOSIVES, MOMENTUM, EQUATIONS OF STATE, CORRECTIONS, COMPRESSIVE PROPERTIES, SHARPNESS, COMBUSTION PRODUCTS.

Subject Categories : Operations Research
      Ammunition and Explosives
      Forestry

Distribution Statement : APPROVED FOR PUBLIC RELEASE