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    Key-Curve Analysis of Linde 80 Welds

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    Some reactor vessel weldments have relatively high copper contents that, when exposed to neutron irradiation, cause reductions in fracture toughness in the Charpy upper-shelf energy temperature region. To address this concern, a large number of both unirradiated and irradiated compact specimens were tested and the resulting J-resistance curves were generated. Key curves were developed from the load displacement records of single-specimen unloading compliance test data for magnesium-molybdenum-nickel/Linde 80 submerged-arc weld metals to study various aspects of toughness data behavior. In this paper, only a number of representative compact specimen tests are analyzed using the Herrera and Landes individual specimen key-curve approach to compare specimen size, temperature, and irradiation effects as part of a J-resistance model development effort for the Linde 80 class of weld metals.

    The results of this study indicate (1) that the key-curve method works when applied to the Linde 80 type weld metals, (2) that a power law representation of the key curve provides a means to extract the Ramberg-Osgood exponent from the key curve if there are no available tensile data for the weld metal, and (3) that the irradiated specimens from both power reactors and a test reactor do not exhibit significant differences in comparable key-curve characteristics.


    key curves, fracture, calibration, unloading compliance, fracture tests, elastic-plastic fracture, test methods

    Author Information:

    Yoon, KK
    Advisory engineers, B&W Nuclear Service Company, Lynchburg, VA

    Van Der Sluys, WA
    Scientist, Alliance Research Center, Babcock & Wilcox, Alliance, OH

    Lowe, AL
    Advisory engineers, B&W Nuclear Service Company, Lynchburg, VA

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP16857S