A new constitutive relationship for the homogeneous deformation of metals over a wide range of strain

Nguyen Q. Chinh, Gyozo Horváth, Zenji Horita, Terence G. Langdon

    研究成果: ジャーナルへの寄稿学術誌査読

    133 被引用数 (Scopus)

    抄録

    The stress-strain relationships of high-purity aluminum and copper were investigated over a wide range of strain by combining data obtained in the conventional tensile and compression testing of annealed samples with data obtained after processing by equal-channel angular pressing (ECAP) to high imposed strains. The true stress-true strain curves were analyzed mathematically taking the absolute strain as zero for the annealed condition and equal to the strain imposed through ECAP for the as-pressed samples. It is shown that, over the entire range of strain inherent in these experiments, the macroscopic stress-strain behavior of Al and Cu may be represented by an exponential power-law constitutive relationship which reduces to the conventional Hollomon power-law relationship at low strains and to the Voce exponential relationship at high strains. It is demonstrated that the results obtained from tensile or compressive testing to low strains at room temperature are sufficient, when used with the new constitutive relationship, to provide detailed information on the nature of the stress-strain behavior to high strains. The validity of the new relationship is supported by theoretical considerations which incorporate the major micro-mechanisms of plastic deformation.

    本文言語英語
    ページ(範囲)3555-3563
    ページ数9
    ジャーナルActa Materialia
    52
    12
    DOI
    出版ステータス出版済み - 7月 12 2004

    !!!All Science Journal Classification (ASJC) codes

    • 電子材料、光学材料、および磁性材料
    • セラミックおよび複合材料
    • ポリマーおよびプラスチック
    • 金属および合金

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