In this study, to evaluate the chemical and mechanical properties of polypropylene (PP), activation‐energy and tensile tests were performed at room temperature (25°C) on pure PP and PP reinforced with glass fibre (GF). To improve the prediction accuracy of the fatigue life, three models based on the calibration of the Zhurkov model were proposed: a regression model, modified strain‐rate model and lethargy coefficient‐based model. Based on the experimental data analysis and statistical assessment results, we proposed a modified strain‐rate model that satisfies the dependency of the physical parameters and is congruent with the predicted fatigue life data. The experimental data and modified strain‐rate model were compared with the direct cyclic analysis results. The tendency of the frequency factor as a correction parameter in the modified strain‐rate model corresponded to the experimental activation energy and the increasing GF content.

中文翻译：

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基于Zurkov疲劳寿命模型的校准，预测25°C聚丙烯材料的应力寿命

在这项研究中，为评估聚丙烯（PP）的化学和机械性能，在室温（25°C）上对纯PP和玻璃纤维（GF）增强的PP进行了活化能和拉伸试验。为了提高疲劳寿命的预测精度，提出了基于Zurkov模型标定的三种模型：回归模型，修正应变率模型和嗜睡系数模型。根据实验数据分析和统计评估结果，我们提出了一种修正的应变率模型，该模型满足了物理参数的依赖性，并且与预测的疲劳寿命数据一致。将实验数据和改进的应变率模型与直接循环分析结果进行了比较。