6061铝合金热压缩变形条件对流变应力的影响及其本构方程的研究

文章根据热压缩试验数据,应用一元线性回归和多元线性回归方法,研究了6061铝合金材料的流动应力与温度、应变速率和应变之间的关系,并根据试验数据确定了6061铝合金材料的本构方程。研究表明,6061铝合金热压缩塑性变形时的流变应力和应变速率之间的关系满足双曲正弦函数关系式;其热压缩塑性变形时流变应力的双曲正弦对数项与绝对温度倒数之间满足线性关系,其高温压缩变形受热激活能的控制。

Influence of hot compressive deformation conditions of 6061 aluminum alloy on flow stress and research on its constitutive equation

In the paper, according to test data, relationships on flow stress, temperature, strain rate and strain of 6061 aluminum alloy is studied through single and multiple regression, and by the test data, constitutive equation of 6061 aluminum alloy is researched. The results show that relationship between flow stress and strain rate is applied to hyperbolic sine equation in the hot compressive deformation of 6061 aluminum alloy; at the same time, relationship between logarithmic hyperbolic sine of its flow stress and reciprocal of absolute temperatures is linear, and hot compressive deformation is controlled by activation energy.