STP868

    Elastic-Plastic Failure Analysis of Pressure Vessel Tests

    Published: Jan 1985


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    Abstract

    The fracture under internal pressure of twelve vessels working in the upper shelf region is analyzed by means of elasto-plastic criteria. The vessels were manufactured from steels with yield stresses ranging from 295 to 861 N/mm2 and toughnesses between 4.1 and 9.2 kN/mm3/2. The vessels were designed to operate at about σys/1.5 and consequently had different thicknesses. Artificial defects were introduced in the base material and in the heat-affected zone. Some of the vessels were tested in the as-welded condition, some in the stress-relieved condition. Critical crack lengths ranged from 110 to 340 mm. The JR method of Paris and a modified version of the two-parameter method of the Central Electricity Generating Board (United Kingdom) were applied. Predicted burst pressures are in good agreement with measured values, the JR method yielding errors within the 3% range and the two-parameter method giving errors ranging from 3 to 8%, always on the conservative side.

    Keywords:

    fracture mechanics, nonlinear fracture mechanics, elasto-plastic fracture mechanics, J, -integral resistance curves, two-parameter method, upper shelf, pressure vessels, critical crack lengths, scale effects, burst tests


    Author Information:

    Sciammarella, CA
    Professor, Department of Mechanical Engineering, Illinois Institute of Technology, Chicago, IL


    Paper ID: STP34276S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP34276S


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