Validation of miniature fracture toughness specimens for material surveillance

Matti Valo, Tapio Planman, Kim Wallin, R. Ahlstrand, J. Kohopää, R. Rintamaa

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

    5 Citations (Scopus)


    Fracture toughness testing in the elastic-plastic temperature range of material behavior is described in the Master Curve standard ASTM 1921-97. The standard allows measurement of valid fracture toughness values up to Kjc= 100 MPa√m with clearly smaller than standard CVN-size specimens for the irradiated material condition. However, a relatively small amount of data measured with miniature specimens of cross-sections 5 mm × 5 mm or 3 mm × 4 mm have been published and hence the utilization of such small specimens is generally not accepted even if the universal specimen size criteria are fulfilled. In this study, the fracture toughness transition temperature T0 has been measured for a high phosphorus content WWER 440 weld coded as W502 both in the non-irradiated and in the irradiated and annealed material conditions. Three-point bend specimens of cross-sections 10 mm × 10 mm, 5 mm × 5 mm and 3 mm × 4mm were used in the study.
    Original languageEnglish
    Title of host publicationSmall Specimen Test Techniques
    EditorsMikhail A. Sokolov, John D. Landes, Glenn E. Lucas
    Place of PublicationWest Conshohocken, PA
    PublisherAmerican Society for Testing and Materials (ASTM)
    ISBN (Electronic)978-0-8031-5465-0
    ISBN (Print)978-0-8031-2897-2
    Publication statusPublished - 2002
    MoE publication typeA4 Article in a conference publication
    Event4th Symposium on Small Specimen Test Technique - Reno, United States
    Duration: 23 Jan 200125 Jan 2001

    Publication series

    SeriesASTM Selected Technical Papers


    Conference4th Symposium on Small Specimen Test Technique
    Country/TerritoryUnited States


    • brittle fracture
    • master curve
    • miniature specimens
    • validity
    • testing


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