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中文摘要：
基于分数Maxwell模型对高密度聚乙烯在不同应力水平和老化时间下的蠕变曲线进行拟合.用遗传算法结合共轭梯度法对模型参数进行优化,当以模型参数松弛时间作为时间标度时,同一应力水平下不同老化时间的蠕变曲线能很好地叠合,即时间-老化时间叠加原理自然满足.
英文摘要：
The creep curves of high-density polyethylene at different stress levels and aging time were using generalized fractional Maxwell model. Genetic algorithm and conjugated gradient method employed to optimize the model parameters. When the time was scaled by the relaxation time, the curves at the same stress levels and different aging time can superpose very well. It means that the fitted were creep timeaging time superposition is naturally satisfied.
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