Evaluation of Ductile Fracture of Structural Steels by Microvoid Model

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著者

    • QIU Hai
    • Research Center for Advanced Science and Technology, The University of Tokyo
    • MORI Hisashi
    • Research Center for Advanced Science and Technology, The University of Tokyo
    • ENOKI Manabu
    • Research Center for Advanced Science and Technology, The University of Tokyo
    • KISHI Teruo
    • Research Center for Advanced Science and Technology, The University of Tokyo

抄録

In the present work, the ductile fracture of structural steels and the effect of plastic pre-strain on ductility have been investigated by tensile test. The fracture process consisting of void nucleation, growth and coalescence was observed by scanning electron microscopy (SEM). The nucleation strain of microvoid was measured experimentally. The critical interfacial strength of particle/matrix interface was calculated by dislocation model and continuum analysis, and the void growth was evaluated by Rice-Tracey model. It was found that longitudinal void coalescence does not affect fracture even though large cracks exist, but particle position affects void nucleation. Thomason's plastic limit-load model was used to predict void growth strain. Through the analysis of ductile fracture process, the influence of plastic pre-strain on ductility was discussed.

収録刊行物

  • ISIJ international  

    ISIJ international 39(4), 358-364, 1999-04-15 

    The Iron and Steel Institute of Japan

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