Accession Number : ADA289870

Title :   Oblique Impact Modeling of Fuzes.

Descriptive Note : Final rept. Oct-Dec 93,

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Gazonas, George A. ; Segletes, Steven B. ; Boyle, Vincent M. ; Stegall, Steven R.

PDF Url : ADA289870

Report Date : JAN 1995

Pagination or Media Count : 58

Abstract : This report presents the results of a combined experimental, numerical, and analytical investigation of a low-speed (198 m/s) oblique impact of a cylindrical steel projectile into an aluminum-brass composite fuze simulant. The numerical simulations were performed prior to the experiments using the Lagrangian hydrocode EP1C92. The results indicate that projectile hardness and impact point strongly influence the mechanism by which the fuze deforms. An experiment was then conducted in order to evaluate the predictive capabilities of the hydrocode. The experimental results generally corroborate the hydrocode results during the initial stages of the impact but depart significantly at later stages of the penetration. Possible causes for the observed differences between the experiment and the simulation include: (1) the absence of a global fracture modeling capability in the hydrocode, and (2) boundary condition differences between experiment and simulation. The hydrocode predicts that 91% of the projectile kinetic energy is converted into target plastic work. This result compares well with predictions based upon an analytical model of an elastic-plastic beam bent by an end load.

Descriptors :   *TERMINAL BALLISTICS, *POINT DETONATING FUZES, PLASTIC DEFORMATION, MATHEMATICAL MODELS, SIMULATION, PROJECTILES, NUMERICAL ANALYSIS, ELASTIC PROPERTIES, TARGETS, FRACTURE(MECHANICS), BOUNDARIES, PENETRATION, CYLINDRICAL BODIES, KINETIC ENERGY, HYDRODYNAMIC CODES, HARDNESS, IMPACT POINT, ORDNANCE STEEL.

Subject Categories : Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE