一、轮对滚柱轴承 1.额定寿命一种轴承的额定寿命系指足够数量轴承中90％的轴承在疲劳剥离的第一个迹象出现之前能够达到或者超过的寿命。内外套圈和滚动体材料的疲劳引起个别金属颗粒或某一区域薄层脱落,这种情况称为疲坑形成,接着将会发生脱层或脱皮现象。 Wheelset Roller Bearings 1. Nominal Life The rated life of a bearing means that 90% of the bearings in a sufficient number of bearings will reach or exceed their life expectancy before the first sign of fatigue stripping occurs. The fatigue of inner and outer ferrules and rolling elements causes the detachment of individual metal particles or thin layers of a certain area, a condition known as fatigue cratering, followed by delamination or peeling.