渐开线花键副微动磨损疲劳寿命预估

为准确预估渐开线花键副微动磨损疲劳寿命,在假设微动磨损与微动疲劳共同作用的情况下,对某型机主减速器花键副的微动损伤机理进行研究.分析国内外现有的微动疲劳预测方法,在传统SWT法预估疲劳寿命的基础上,忽略疲劳发生的位置和方向,给出花键副的损伤累积计算方法,在给定工况下预估航空花键副微动磨损疲劳寿命.结果表明:花键副微动作用过程中,微动磨损与微动疲劳互相竞争互相抑制,最终导致花键副在两种微动模式共同作用下发生疲劳失效;花键副的疲劳寿命随着SWT值的增大而减小.提出的损伤累积模型能较准确地反映微动磨损对微动疲劳的作用,为花键副的设计和维修提供了数值参考,也为进一步研究考虑齿侧间隙时的花键副微动磨损疲劳寿命预估提供了依据.

Fretting wear-fatigue predictions in a spline couplings

To forecast the fatigue life of spline couplings accurately, taking the interaction of fretting wear and fretting fatigue into account, the fretting damage mechanism of a spline coupling was investigated, the prediction methods of fretting fatigue were analyzed, and by ignoring the position and direction of fatigue occurring, a new damage accumulation method based on SWT method for spline was provided, and the fretting fatigue life of this spline coupling under the given conditions was predicted. The results show that in the fretting process of spline coupling fretting wear and fretting fatigue competes and restrains with each other and leads to the spline coupling fatigue failure under the effect of two fretting modes eventually, the fatigue life of the spline coupling decreases with the SWT increasing. The damage accumulation method can reflect the effect of fretting wear on the fretting fatigue accurately, it gives a numerical reference for the designing and repairing of spline coupling, and at the same time, it also provides a basis for the further study of prediction fretting fatigue life in spline couplings which have clearance between the teeth.