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    Elastic-Plastic Analysis of a Nozzle Corner Crack by the Finite-Element Method

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    The paper presents the results of an elastic-plastic three-dimensional finite-element analysis for a nozzle corner crack in a pressurized reactor test vessel. The calculations were performed by the finite-element program ADINA using the von Mises yield condition and isotropic hardening. The crack plane was taken parallel to the axis of the vessel and the crack front straight and perpendicular to the symmetry line of the nozzle corner in order to obtain the worst position for a nozzle corner crack. The calculations were performed up to that pressure level where general yield of the ligament in the nozzle corner section takes place.

    For the chosen crack length, which is relatively small in comparison with the ligament, the stress normal to the ligament plane and the crack-opening displacement have a maximum in the center of the crack. The differences between the maximum and minimum values along the crack front increase rapidly in the plastic range when the pressure load is raised above half of the general yield pressure. The results of the finite-element analysis are compared with figures obtained from analytical procedures of elastic-plastic fracture mechanics.


    elastic-plastic fracture, finite-element analysis, fractures (materials), reactor vessels, stress-intensity factor, crack-opening displacement, nozzle corner crack

    Author Information:

    Brocks, W
    Bundesanstalt für Materialprüfung (BAM), Berlin,

    Erbe, H-H
    University of Bremen, Bremen,

    Noack, H-D
    Bundesanstalt für Materialprüfung (BAM), Berlin,

    Veith, H
    Bundesanstalt für Materialprüfung (BAM), Berlin,

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP37298S