Accession Number : AD0636963

Title :   MECHANISMS OF METALLIC FAILURE: FLAW INITIATION TECHNIQUES AND MEASUREMENTS IN THIN-WALL PRESSURE VESSELS.

Corporate Author : AUBURN RESEARCH FOUNDATION ALA

Personal Author(s) : Maynor,Hal W. , Jr. ; Busch,Courtney C.

Report Date : 29 JUN 1966

Pagination or Media Count : 27

Abstract : A hydraulic system was designed and constructed for the purpose of introducing surface or part-through-the-thickness cracks to thin-wall (0.065-in.) scale-model pressure vessels. The hoop stresses resulting from internal pressure, in the range 4000 to 5000 psi, will be applied as pressure pulses at frequencies up to 160 cycles per minute for numbers of cycles required to grow cracks of predetermined lengths. The system consists essentially of a motor-driven hydraulic pump, valves, fittings, tubing and appropriate instrumentation. A component of the system, a manually-operated hydraulic pump, will afford burst pressures up to 30,000 psi to test vessels containing induced cracks. Several vessels were fabricated from 18 per cent nickel (250 grade) maraging steel. (Author)

Descriptors :   (*PRESSURE VESSELS, *FRACTURE(MECHANICS)), (*HYDRAULIC EQUIPMENT, TEST EQUIPMENT), RUPTURE, MARAGING STEELS, NICKEL ALLOYS, FAILURE(MECHANICS), MODEL TESTS, TOUGHNESS, STEEL, STRESSES

Subject Categories : Metallurgy and Metallography
      Containers and Packaging
      Hydraulic and Pneumatic Equipment
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE