Accession Number : ADA292476

Title :   Ballistic Penetration Phenomenology of High Symmetry Single Crystals

Descriptive Note : Final rept. Mar 89-Mar 90,

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Kingman, Pat W. ; Herring, Rodney A.

PDF Url : ADA292476

Report Date : FEB 1995

Pagination or Media Count : 32

Abstract : The ballistic performance of tungsten single crystal penetrators is known to be a function of crystallographic symmetry. The macroscopic deformation geometry of both single crystal and polycrystal tungsten penetrators is a continuous eversion of the rod into a hollow tube. The differences in energy partitioning leading to these variations in ballistic performance must therefore be accounted for by detailed material deformation processes governed by crystallographic orientation. Inferences about these processes have been drawn from microstructural characterization of recovered penetrators. Residual penetrators of both 011 and 111 orientations were found to have repeatedly deformed and recrystalized, but the actual operative processes led to quite different macrostructures, microstructures, and penetration depths. The 001 orientation deformed by a unique process which allowed very efficient deformation, resulting in maximum penetration depth. These single crystal experiments demonstrate the critical role of detailed deformation processes in determining the final penetration depths even when similar macroscopic material flow geometry occurs. jg

Descriptors :   *SINGLE CRYSTALS, *PENETRATION, *SYMMETRY, *BALLISTICS, MICROSTRUCTURE, MATERIALS, DEFORMATION, ENERGY, ORIENTATION(DIRECTION), EFFICIENCY, DEPTH, RESIDUALS, RODS, CRYSTALLOGRAPHY, TUNGSTEN ALLOYS, TUBES.

Subject Categories : Crystallography
      Inorganic Chemistry
      Physical Chemistry
      Properties of Metals and Alloys
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE