Evaluation of the effects of mixed-mode I-II loading on elastic-plastic ductile fracture of metallic materials

Anssi Laukkanen, Kim Wallin, Rauno Rintamaa

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

    12 Citations (Scopus)


    In order to evaluate the mixed-mode fracture behavior of elastic-plastic metallic materials, experimental tests and numerical calculations were carried out. Since the transition of fracture toughness between opening and in-plane shear modes with ductile materials is a question of controversy, single-edge notched bend (SENB) specimens were subjected to asymmetric four-point bending (ASFPB) to provide various mode portions using four materials: A533B pressure vessel steel, F82H ferritic stainless steel, sensitized AISI 304 austenitic stainless steel, and CuA125 copper alloy. Fracture resistance curves were determined and fractographical studies performed. Numerical studies focused on determining the J-integral and stress intensity factor (SIF) solutions for the experimental program and the Gurson-Tvergaard constitutive model was used to simulate continuum features of the fracture process. The results demonstrate that Mode II fracture toughness of ductile metallic materials can be significantly lower than Mode I fracture toughness. Studies of the micromechanical aspects of fracture demonstrate the factors and variables responsible for the behavior noted in this investigation.
    Original languageEnglish
    Title of host publicationProceedings of the Symposium on Mixed-Mode Crack Behavior
    EditorsK.J. Miller, D.L. McDowell
    PublisherAmerican Society for Testing and Materials (ASTM)
    ISBN (Print)0-8031-2602-6
    Publication statusPublished - 1999
    MoE publication typeA4 Article in a conference publication
    EventSymposium on Mixed-Mode Crack Behavior - Atlanta, United States
    Duration: 6 May 19987 May 1998

    Publication series

    SeriesASTM Special Technical Publication


    ConferenceSymposium on Mixed-Mode Crack Behavior
    Country/TerritoryUnited States


    • ductile fracture
    • mixed-mode
    • Mode I
    • Mode II
    • fracture toughness
    • fractography
    • shear fracture J-integral
    • Gurson-Tvergaard model
    • ProperTune


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