Ligament size limitations in brittle fracture toughness testing

Juha Toivonen, Juha Pietikäinen, Kim Wallin

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


    The requirements for the specimen size in general, the fracture process zones and the validity of the results in the ductile to brittle transition region in fracture toughness testing are examined. Based on literature studies it is proposed that J-integral describes the cleavage fracture initiation event as long as the ligament size is b≥50 /J/σflow). At higher load levels the effective load Jeff becomes constant and ductile tearing will precede cleavage fracture. The experimental part consists of Acoustic Emission measurements during J-integral tests. The rapid diminishing of the AE, which is due to the cessation of the growth of the plastic zone, implies the reaching of a maximun Jeff level. Corresponding ligament size requirement is b≥44-75 (J/σflow).
    Original languageEnglish
    Title of host publicationStrength of Metals and Alloys (ICSMA 8)
    Subtitle of host publicationProceedings of the 8th International Conference On The Strength Of Metals and Alloys
    Place of PublicationTampere
    PublisherTampereen teknillinen korkeakoulu
    ISBN (Print)978-0-08-034804-9
    Publication statusPublished - 1988
    MoE publication typeA4 Article in a conference publication
    Event8th International Conference on Strength of Metals and Alloys, ICSMA 8 - Tampere, Finland
    Duration: 22 Aug 198826 Aug 1988


    Conference8th International Conference on Strength of Metals and Alloys, ICSMA 8


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