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以M50NiL航空圆柱滚子轴承为研究对象,基于Lundberg-Palmgren疲劳寿命理论和Hertz接触理论,结合Goodman公式及材料P-S-N曲线,综合考虑热应力和结构应力的共同作用,建立其疲劳寿命模型。该模型主要与最大Hertz接触应力及材料系数相关。在有限元软件ANSYS求解应力过程中,采用热塑性有限元法,计算温度场载荷;将摩擦热载荷产生的温度场和热应力分布做为应力分析的边界条件,推导轴承在热力耦合下的应力分布规律,并对某直升机单工况作用下的主减速器圆柱滚子轴承给出疲劳寿命评估,评估表明与试验值误差仅为11.61%。研究结果表明,该疲劳寿命模型综合考虑热应力和结构应力的影响,是一种安全、有效的疲劳寿命估算方法。
Based on Lundberg-Palmgren fatigue life theory and Hertz contact theory, combined with Goodman’s formula and P-S-N curve, the M50NiL aerospace cylindrical roller bearing is taken as the research object. Based on the combined effect of thermal stress and structural stress, the fatigue life model is established. The model is mainly related to the maximum Hertz contact stress and material factor. In finite element software ANSYS, the finite element method is used to calculate the temperature field load by using the finite element method. The temperature field and thermal stress field generated by frictional heat load are taken as the boundary conditions for stress analysis, and the stress distribution of the bearing under thermal coupling is deduced The fatigue life of the main reducer cylindrical roller bearing under the single working condition of a helicopter is evaluated. The evaluation shows that the error with the test value is only 11.61%. The results show that the fatigue life model is a safe and effective method to estimate the fatigue life by comprehensively considering the influence of thermal stress and structural stress.