Accession Number : ADA307839

Title :   The Penetration of Porous Projectiles in Aluminum and Plastic Targets.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER

Personal Author(s) : Fish, Richard H.

PDF Url : ADA307839

Report Date : APR 1968

Pagination or Media Count : 12

Abstract : Cylindrical projectiles of polyurethane plastic, with a fineness ratio of 2/3 and densities ranging from 1.17 gm/cc for the solid material to 0.065 gm/cc for the lightest porous material, impacted targets of 2O24-T351 aluminum alloy and polycarbonate plastic at velocities from 3.43 to 7.08 km/sec. Solid projectiles with the fineness ratio appropriately reduced to give the same mass as some of the porous projectiles were also tested for comparison with the porous projectiles. the results of the investigation indicated that the solid projectiles penetrated as deeply as the porous projectiles of the same mass, but their crater shapes and volumes were different. The depths of penetration in the two different target materials could be correlated on the basis of the density ratio raised to the 2/3 power, without considering other physical properties such as strength. Comparison of the data of the present investigation with other plastic-projectile data indicated that the present data fall in low-speed or transition regions of impact.

Descriptors :   *ALUMINUM ALLOYS, *PROJECTILES, *POLYURETHANE RESINS, VELOCITY, DENSITY, RATIOS, IMPACT, PHYSICAL PROPERTIES, COMPARISON, SHAPE, SOLIDS, TARGETS, DEPTH, REGIONS, PENETRATION, CYLINDRICAL BODIES, ALUMINUM, TRANSITIONS, PLASTICS, POLYCARBONATES, POROUS MATERIALS, CRATERS, FINENESS RATIO.

Subject Categories : Laminates and Composite Materials
      Properties of Metals and Alloys
      Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE