STP1131

    Three-Dimensional Elastic-Plastic Analysis of Small Circumferential Surface Cracks in Pipes Subjected to Bending Load

    Published: Jan 1992


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    Abstract

    This study presents the elastic-plastic behavior of a circumferentially surfacecracked pipe using the finite element method based on a three-dimensional model.

    The action of a pure bending load on the pipe is analyzed for three crack depths with a/t equal to 0.25, 0.5, and 0.75, and their eccentricities, a/c, being 0.2, 0.4, and 0.6, respectively.

    The material obeys a Ramberg-Osgood power law. The goals are to determine the stressstrain fields and the values of J on the crack front, to define the different plastic deformation stages reached as the load on the crack is increased, and to validate the Central Electricity Generating Board (U.K.) (CEGB) two-criteria rule for circumferential surface flaws on the basis of the J results.

    Keywords:

    ductile fracture, elastic-plastic behavior, cracked pipe, semielliptical surface crack, pure bending, J, -values, estimation scheme, RH/R6 rule, three-dimensional meshes, fracture mechanics, fatigue (materials)


    Author Information:

    Franco, C
    Mechanical engineer and expert, Fracture Mechanics, FRAMATOME, Paris-La Defense,

    Gilles, P
    Mechanical engineer and expert, Fracture Mechanics, FRAMATOME, Paris-La Defense,


    Paper ID: STP23704S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP23704S


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