Remarks on the Woodthorpe–Pearce “anomalous” behavior in sheet metals(SCI二区)
Remarks on the Woodthorpe–Pearce “anomalous” behavior in sheet metals(SCI二区)
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DOI：
10.1016/j.ijmecsci.2016.01.026
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发表时间：
2016
影响因子：
7.3
通讯作者：
Chi-Sing Man
中科院分区：
文献类型：
--
作者：
Mojia Huang;Chi-Sing Man
适应Woodthorpe-Pearce“反常”行为的能力经常被用来作为判断板材屈服函数灵活性的标准。对于既不表现出尖锐屈服点也不表现出完全塑性行为的金属，这个术语的含义在通常使用中变得模糊不清;相反，我们用它来指代伍德索普和皮尔斯[3]在他们对平均r值< 1的铝板的研究中观察到的和未能预测到的，即：在拉伸试验中，平衡双轴流动曲线总是位于普通图中平均单轴流动曲线的上方，其中横轴表示平衡双轴真应变，单轴真应变表示平均单轴流动曲线。两条曲线的应变。本文利用具有各向同性应变硬化的广义Hershey-Hosford屈服函数，证明了伍德索普和皮尔斯实验中的平衡双轴流变曲线可以由它们相应的平均单轴流变曲线预测。此外，我们的分析和其他例子表明，上述由伍德索普和皮尔斯创造的“异常”应该相当普遍。
The capability to accommodate the “Woodthorpe–Pearce ‘anomalous’ behavior” has often been used as a criterion to judge the flexibility of yield functions for sheet metals. For metals which exhibit neither sharp yield points nor perfectly plastic behavior, the meaning of this term becomes ambiguous in common usage; instead, we employ it to refer to what Woodthorpe and Pearce [3] observed and failed to predict in their study on aluminum sheets with average r-value< 1, namely: in tension tests the balanced biaxial flow curve always lies above the average uniaxial flow curve in a common figure where the horizontal axis denotes the balanced biaxial true-strain and the uniaxial true-strain for the two curves, respectively. In this paper, using the generalized Hershey–Hosford yield function with isotropic strain hardening, we show that the balanced biaxial flow curves in Woodthorpe and Pearce׳ s experiments can be predicted from their corresponding average uniaxial flow curves. Moreover, our analysis and other examples suggest that the aforementioned “anomaly” coined by Woodthorpe and Pearce should be quite common.