以航空发动机涡轮盘GH4133合金材料为例,通过比较和分析SWT模型和Morrow模型,综合考虑平均应力效应对低周疲劳寿命的影响,提出了一种改进的适合轮盘疲劳寿命预测的能量模型,进行了寿命预测和可靠性分析,并依据试验数据对能量模型进行拟合和模型验证。结果表明该方法有较高的准确性,能用于不同载荷谱下的疲劳寿命预测和可靠性评估。 Aeroengine turbine disc GH4133 alloy is taken as an example. By comparing and analyzing the SWT model and the Morrow model, considering the effect of the average stress effect on the low cycle fatigue life, an improved energy model suitable for the fatigue life prediction of the roulette wheel is proposed. Life prediction and reliability analysis were conducted, and the energy model fitting and model verification were based on the experimental data. The results show that the method has high accuracy and can be used to predict fatigue life and evaluate reliability under different load spectra.