• جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 678
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     initial and subsequent yield surfaces for 6061 aluminum, determined by a method of automated yield stress probing, are presented in the 2d (σzz − σθz) and 3d (σθθ − σzz − σθz) stress spaces. in the (σzz − σθz) space, yield surfaces at small pre-strains show the noses and unapparent cross effect. at larger pre-strains, they become ellipses with positive cross effect. in the (σθθ − σzz − σθz) space, the initial yield surface is not well described by von mises yield criterion due to material anisotropy. the yield surfaces of various torsional pre-strains show obvious rotation around the σzz axis but they do not rotate when subjected to axial pre-strains. therefore, the rotation behavior of yield surface is pre-strain path dependent. the rotation of yield surfaces in the 3d space is the emphasis of the present paper. coupled axial–torsional behavior subjected to torsion after axial pre-strain are also presented for the same material that is used to determine the yield surfaces. this information is useful for verification of constitutive models.

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