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首页> 外文期刊>Journal of Materials Processing Technology >Effects of temperature on yield locus for 5083 aluminum alloy sheet
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Effects of temperature on yield locus for 5083 aluminum alloy sheet

机译：温度对5083铝合金薄板屈服点的影响

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摘要

Warm press forming of aluminum alloy sheets is quite attractive, since undesirable stretcher strain marks, which often appear on the surface of the sheets during cold press forming, will disappear at high temperature, and furthermore, some aluminum alloys exhibit high-temperature superplasticity at a certain forming speed. In order to determine the optimum condition of press forming for an aluminium alloy sheet, the effect of forming temperature on the yield locus was experimentally investigated. The yield locus for a fine-grain Al-Mg alloy (5083-O) sheet was obtained by performing biaxial tensile tests, using cruciform specimens, at temperatures of 30, 100, 170, 250 and 300 deg C at strain rate of 10 s~(-1). The size of yield locus drastically decreased with increasing temperature. Neither von Mises' criterion or Hill's can well predict the shape of the yield locus of this sheet metal. Instead of these quadratic yield functions, the yield criterion of Logan-Hosford or Barlat is a better choice for the accurate description of biaxial stress-strain responses at a high temperature.
机译：铝合金板的热压成型非常吸引人，因为在冷压成型期间常出现在板表面上的不希望的拉伸应变痕迹在高温下会消失，此外，某些铝合金会在高温下表现出高温超塑性。一定的成型速度。为了确定压制铝合金板的最佳条件，实验研究了成型温度对屈服点的影响。通过使用十字形试样在30、100、170、250和300℃的温度下以10 s的应变速率进行双轴拉伸试验，获得了细晶粒的Al-Mg合金（5083-O）板材的屈服点〜（-1）。产量位点的大小随着温度的升高而急剧下降。冯·米塞斯（von Mises）的判据或希尔氏（Hill）判据都不能很好地预测这种板材的屈服轨迹的形状。代替这些二次屈服函数，Logan-Hosford或Barlat的屈服准则是准确描述高温下双轴应力-应变响应的更好选择。

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