Development of a Three-dimensional Model for Ductile Fracture in Materials Containing Two Types of Microvoids

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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

There are three stages in ductile fracture process: voids initiation, void growth and void coalescence. In the final stage, ductile fracture occurs due to the void coalescence. Thomason suggested that voids begin to coalesce when a plastic limit-load condition is fulfilled for localized plastic failure of the intervoid matrix. On the basis of this critical void-coalescence condition, we developed a three-dimensional model for ductile fracture considering two types of voids with different sizes, and applied this model to a SA440 steel with and without pre-straining. With the critical strength of particle/matrix interface and the theoretical void growth strain obtained from the model, the reason for the decrease in fracture strain caused by plastic pre-strain was discussed.

収録刊行物

  • ISIJ international  

    ISIJ international 39(4), 352-357, 1999-04-15 

    The Iron and Steel Institute of Japan

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