开展了45号钢在变幅加载下的疲劳试验,基于试验结果,对Miner模型、Manson-Halford模型、Corten-Dolan模型和叶笃毅模型的预测精度进行对比分析,并基于非等效累积损伤原则,以Miner模型和Manson-Halford模型为基础分别构建了2种新的非等效累积损伤模型.结果表明:4种模型中,Manson-Halford模型的预测精度好于其余3种模型,而本文构建的新的非等效累积损伤模型的预测结果要优于Manson-Halford模型,并且其计算模式较为简便,适宜工程应用.
The fatigue test of No.45 steel under variable amplitude loading was carried out. Based on the experimental results, the prediction accuracy of Miner model, Manson-Halford model, Cortan-Dolan model and YE Duyi model is compared and analyzed. Based on Miner model and Manson-Halford model, two new nonequivalent cumulative damage models are constructed respectively with the principle of nonequivalent cumulative damage. The results show that, the prediction accuracy of Manson-Halford model is better than the other three models, and the prediction results of new nonequivalent cumulative damage models constructed in this paper are better than that of Manson-Halford model, and its calculation mode is relatively simple and suitable for engineering application.
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