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设计了一种简易单向拉伸蠕变试验装置,对2024T4铝合金在175℃、多个应力水平下的单向拉伸蠕变进行了试验。根据试验数据的特点,将2024T4铝合金的蠕变本构关系分解为由一个双指数函数和一个一次函数组成的两分量表达式,并利用试验数据通过最小二乘拟合确定出本构关系中的待定参数,得到2024T4铝合金175℃时的本构关系。通过对拟合数据与试验数据的对比分析表明,所建立的蠕变本构关系能够有效表征2024T4铝合金175℃时在不同应力水平下的蠕变行为。
A simple uniaxial tensile creep testing device was designed to test the uniaxial tensile creep of 2024T4 aluminum alloy at 175 ℃ and several stress levels. According to the characteristics of the experimental data, the creep constitutive relation of 2024T4 aluminum alloy is decomposed into a two-component expression consisting of a double exponential function and a linear function, and the test data is used to determine the constitutive relationship through least squares fitting Of the to be determined parameters obtained 2024T4 aluminum alloy 175 ℃ when the constitutive relationship. The comparative analysis of fitting data and experimental data shows that the established creep constitutive relation can effectively characterize the creep behavior of 2024T4 aluminum alloy at different stress levels at 175 ℃.