COMPARISON OF NUMERICAL MODELING OF PENETRATION OF A CAPPED PROJECTILE WITH A WINDSCREEN INTO SPECIAL TREATMENT STEEL WITH TRADITIONAL FORMULAE

摘要

The penetration of Armor Piercing, Capped (APC) projectiles into Special Treatment Steel is notnew [1]. Many years ago the means of calculating the ballistic limit, residual velocity, etc. were basedon semi-empirical formulae garnered from actual tests [2]. Major geometric changes in the design of aprojectile, cap and windscreen made some difference in the ability of the shell to penetrate armor plate.The purpose of this paper is to attempt to determine a reasonable method to model the mechanicalproperties of the target material as well as the projectile components to reasonably match the test dataand compare with the semi-empirical models. The projectile chosen is a U.S. Navy 14 inch Mark 16Model 8 projectile depicted in Figure 1. This projectile has been modeled using the Abaqus finiteelement software. It is believed that the triaxiality of the target material has a great effect on the results[3]. This was compared to the semi-empirical formulae of Lambert and Thompson as well as that ofOkun [4]. The modifications to the mechanical properties in the Abaqus model to incorporate triaxialityare discussed. The models were in very good agreement over a fair range of target thicknesses andimpact obliquities but not at high obliquities and large target thicknesses.