Accession Number : ADA954400

Title :   Metallurgical Examination of Defective Carnegie-Illinois 2-1/4 inch, 60mm, and 21/2 inch Homogeneous Armor Plates.

Descriptive Note : Memorandum rept.,

Corporate Author : WATERTOWN ARSENAL LABS MA

Personal Author(s) : Riffin,P. V.

Report Date : 25 OCT 1943

Pagination or Media Count : 8

Abstract : The armor plate exhibited unsatisfactory ballistic behavior in the PTP test at high obliquities because of the presence of laminations in the zone midway between the surface and center of the plates. Nonmetallic segregations, probably discontinuous stringers, are believed to be the4 cause of these laminations, which are most effectively revealed by the fracture test. Present ballistic specifications do not adequately reveal the presence of poor steel quality which may show up under service conditions where the impacts frequently occur at high obliquities, thus making it mandatory either to incorporate a more selective ballistic test into the specifications or depend upon a fracture test to eliminate poor quality steel.

Descriptors :   ARMOR PLATE, BALLISTICS, BEHAVIOR, FRACTURE(MECHANICS), LAMINATES, METALLURGY, PLATES, QUALITY, SPECIFICATIONS, STEEL

Subject Categories : Metallurgy and Metallography
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE