AN INVESTIGATION OF THE STRESSES IN A DISCONTINUITY REGION OF A PRESSURE VESSEL (thesis)

Technical Report · Mon Jul 21 04:00:00 EDT 1958

DOI:https://doi.org/10.2172/4329000· OSTI ID:4329000

Greenstreet, B. L.

A thin-walled cylindrical pressure vessel was held at 1500 deg F in an inert atmosphere until creep-rupture occurred. The vessel was made of lnconel, aud it had a flat-plate head at one end. This configuration yielded high discontinuity stresses in the region of the head-to-shell junction. As the vessel deformed due to creep of the material, its configuration changed. In order to determine the effect of this continual change in configuration upon the stress distribution at the flat-plate head end of the shell, the test was interrupted at various time intervals. The specimen was removed from the furnace, and it was loaded by internal pressure at room temperature. The resulting strains were measured using strain gages, and the corresponding stresses were calculated. In addition to the strain measurements, the dimensions of the vessel were also obtained. Initially, the maximum axial stress in the cylinder which existed where the flat head and cylinder were joined was approximately ten times the circumferential membrane stress. However, the high stresses at the junction of the head and cylinder decreased with creep time, and the vessel failed in a region where the membrane stresses predominated throughout the test. The circumferential strain in this region was approximately twelve percent while it was approximately four percent in the high stress region. (auth)

• Research Organization: Oak Ridge National Lab., Tenn.
• DOE Contract Number: W-7405-ENG-26
• NSA Number: NSA-12-012370
• OSTI ID: 4329000
• Report Number(s): ORNL-2537
• Country of Publication: United States
• Language: English

Related Subjects

ALUMINUM ALLOYS
CHROMIUM ALLOYS
CONFIGURATION
CREEP
CYLINDERS
DEFORMATION
DISSERTATION
ENGINEERING
FAILURES
FURNACES
GAGES
HIGH TEMPERATURE
INCONEL ALLOYS
INERT GASES
MEASURED VALUES
NICKEL ALLOYS
NIOBIUM ALLOYS
PLATES
PRESSURE VESSELS
SHELLS
STRESSES
THICKNESS
TITANIUM ALLOYS