A crack-location correction for T 0 analysis of an alloy 52 dissimilar metal weld

Sebastian Lindqvist (Corresponding Author), Matias Ahonen, Jari Lydman, Pentti Arffman, Hannu Hänninen

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)


    For narrow-gap Alloy 52 dissimilar metal welds, the fusion boundary between the ferritic pressure vessel steel and austenitic Ni-base alloy weld metal is the weakest region from fracture mechanical perspective. Producing of the pre-crack for fracture toughness test specimens in the fusion boundary region to determine T 0 is challenging. For pre-cracks further away from the fusion boundary, the brittle fracture initiation does not necessarily occur on the initial crack plane, but rather in the fusion boundary region. This offset in initiation site can increase the measured fracture toughness leading to a nonconservative T 0 estimate. In this study, a method is proposed for correcting the fracture toughness for crack location and obtaining a lower boundary fracture toughness curve. The crack-location correction shows promise for analysing T 0 of specimens with pre-cracks systematically at a significant distance from the weakest region, but with brittle fracture initiation still occurring at the weakest location.

    Original languageEnglish
    Pages (from-to)320-334
    JournalEngineering Fracture Mechanics
    Publication statusPublished - 1 Jun 2019
    MoE publication typeA1 Journal article-refereed


    The results for this paper originate from the NIWEL-project (Nickel-Base Alloy Welding Forum) funded by the Finnish Funding Agency for Technology and Innovation (TEKES), Scandinavian NPP Industry and VTT. The writing was funded by the project LOST (Long term operational aspects of structural integrity) that was part of SAFIR2018 (The Finnish Research Programme on Nuclear Power Plant Safety 2015–2018).


    • Brittle fracture
    • Brittle fracture initiation
    • Crack path
    • Dissimilar metal weld
    • Master Curve


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