航空航天轴承接触疲劳寿命分析

摘要

A method of analyzing and calculating contact fatigue life of aerospace bearing under arbitrary application load is presented in this paper. The input load data is transformed into stress according to the line-contact stress formula and fatigue equation of constantife. Bringing the stress into the commonly used empirical formula of high cycle fatigue, the amended contact fatigue life under arbitrary application load is obtained. Taking the bearing series MS21438 of the roller wheel track applied in wing flap mechanism as an example, its contact fatigue life is calculaed under its working load. Furthermore, we obtain the conclusion that the service life is prolonged obviously as the model number of bearings increases. The result could provide helpful reference for choosing aerospace bearing designation and confirming bearing ＇s repair cycle.%提出一种航空航天轴承在任意使用载荷下接触疲劳寿命的分析方法。利用线接触应力公式和等寿命转化公式对载荷输入数据进行转化,之后将载荷数据代入到描述高周疲劳的常用经验公式中,经修正得到任意使用载荷下的接触疲劳寿命。以航空航天轴承中的MS21438轴承系列用做襟翼滚轮滑轨运动机构上的滚轮为例,得到此轴承系列在使用载荷下的飞行架次寿命,随轴承选用型号的增大,轴承可使用的飞行架次显著增大。