Fracture toughness transferability study between the master curve method and a pressure vessel nozzle using local approach

Anssi Laukkanen, Pekka Nevasmaa, Heikki Keinänen, Kim Wallin

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    Local approach methods are to greater extent used in structural integrity evaluation, in particular with respect to initiation of an unstable cleavage crack. However, local approach methods have had a tendency to be considered as methodologies with 'qualitative' potential, rather than quantitative usage in realistic analyses where lengthy and in some cases ambiguous calibration of local approach parameters is not feasible. As such, studies need to be conducted to illustrate the usability of local approach methods in structural integrity analyses and improve upon the transferability of their intrinsic, material like, constitutive parameters. Improvements of this kind can be attained by constructing improved models utilizing state of the art numerical simulation methods and presenting consistent calibration methodologies for the constitutive parameters. The current study investigates the performance of a modified Beremin model by comparing integrity evaluation results of the local approach model to those attained by using the constraint corrected Master Curve methodology. Current investigation applies the Master Curve method in conjunction with the T-stress correction of the reference temperature and a modified Beremin model to an assessment of a three-dimensional pressure vessel nozzle in a spherical vessel end. The material information for the study is extracted from the 'Euro-Curve' ductile to brittle transition region fracture toughness round robin test program. The experimental results are used to determine the Master Curve reference temperature and calibrate local approach parameters. The values are then used to determine the cumulative failure probability of cleavage crack initiation in the model structure. The results illustrate that the Master Curve results with the constraint correction are to some extent more conservative than the results attained using local approach. The used methodologies support each other and indicate that with the applied local approach and Master Curve procedures reliable estimates of structural integrity can be attained for complex material behavior and structural geometries.
    Original languageEnglish
    Title of host publicationASME 2003 Pressure Vessels and Piping Conference Proceedings
    PublisherAmerican Society of Mechanical Engineers (ASME)
    ISBN (Print)0-7918-4153-7
    Publication statusPublished - 2003
    MoE publication typeA4 Article in a conference publication
    EventASME 2003 Pressure Vessels and Piping Conference, PVP 2003 - Cleveland, United States
    Duration: 20 Jul 200324 Jul 2003


    ConferenceASME 2003 Pressure Vessels and Piping Conference, PVP 2003
    Country/TerritoryUnited States


    • pressure vessels
    • nozzles
    • fracture toughness
    • ProperTune


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