Measurement and analysis of differential work hardening in cold-rolled steel sheet under biaxial tension
Measurement and analysis of differential work hardening in cold-rolled steel sheet under biaxial tension
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DOI：
10.1016/s0924-0136(98)00155-1
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发表时间：
1998-08-01
影响因子：
6.3
通讯作者：
Kuroda, K
中科院分区：
文献类型：
--
作者：
Kuwabara, T;Ikeda, S;Kuroda, K
采用新设计的十字形试件对冷轧钢板进行了双向拉伸试验。在伺服控制的双向拉伸试验机上，试件在线性加载路径下变形。得到的最大等效应变为0.04。在每个实验过程中，塑性各向异性与主应力保持同轴。然而，在双轴应力空间中，塑性功的连续轮廓逐渐改变其形状，例证了Hill和Hutchinson(Trans.ASME J.Appl.机甲。59(1992)1)和Hill等人。(整型J.Solids Struct.31(1994)2999)。将整个工作等高线的几何形状与根据现有的几个屈服准则计算的屈服轨迹进行了比较。Hill的二次屈服准则高估了测量的工作轮廓；特别是在平衡双向拉伸附近，差异很大，而其他屈服准则很好地描述了工作轮廓的行为。唯一能够很好地描述工作轮廓和面内r值分布的总体趋势的屈服准则是后藤的双二次屈服准则。此外，还观察到对数塑性应变增量的分量与应力空间中与当前工作轮廓相关的法线分量成正比。因此，至少在线性加载路径下，工作轮廓似乎瞬时起到塑性势的作用。(C)1998 Elsevier Science S.A.保留所有权利。
Biaxial tensile tests of cold-rolled steel sheet were carried out using newly designed cruciform specimens. The specimens were deformed under linear loading paths in a servo-controlled biaxial tensile testing machine. The maximum equivalent strain attained was 0.04. Plastic orthotropy remained coaxial with the principal stresses throughout every experiment. However, the successive contours of plastic work in biaxial stress space changed their shapes progressively, exemplifying a phenomenon which has been termed differential work hardening by Hill and Hutchinson (Trans. ASME J. Appl. Mech. 59 (1992) 1) and by Hill et al. (Int. J. Solids Struct. 31 (1994) 2999). The geometry of the entire family of the work contours was compared with the yield loci calculated from several existing yield criteria. Hill's quadratic yield criterion overestimated the measured work contours; in particular, in the neighborhood of balanced biaxial tension, the discrepancy was large, while the other yield criteria described the behavior of the work contours well. The only yield criterion that could describe the general trends of the work contours as well as the in-plane r-value distribution with good accuracy was Gotoh's biquadratic yield criterion. Moreover, it was observed that the components of an increment of logarithmic plastic strain are proportional to the components of the associated normal to the current work contour in stress space. Accordingly, it appears that the work contours act instantaneously as plastic potentials, at least under linear loading paths. (C) 1998 Elsevier Science S.A. All rights reserved.