Computer simulation of Portevin-LeChatelier effect based on strain softening model

R. Onodera, T. Morikawa, K. Higashida

    研究成果: ジャーナルへの寄稿学術誌査読

    6 被引用数 (Scopus)

    抄録

    A new phenomenological theory for the Portevin-LeChatelier effect is proposed. The theory is based on an unknown internal stress Yir which decreases with strain (work softening) and increases with time (age hardening). Yir is introduced to satisfy the negative rate sensitivity (n.r.s.) of flow stress and it is supposed to be due to very fine clusters which are cut by dislocation and restored by solute atom diffusion. Almost all constants used in the theory can be determined by tensile test. The results of simulation can explain the effect of temperature, strain and strain rate on the onset strain of P-L effect. Especially, the model can explain the no-occurrence of P-L effect under the n.r.s. condition in aged Al-Cu alloy, and the quantity of transition strain in tensile test in which the crosshead speed is abruptly changed.

    本文言語英語
    ページ(範囲)533-536
    ページ数4
    ジャーナルMaterials Science and Engineering: A
    234-236
    DOI
    出版ステータス出版済み - 8月 30 1997

    !!!All Science Journal Classification (ASJC) codes

    • 材料科学一般
    • 凝縮系物理学
    • 材料力学
    • 機械工学

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