Research on Elastic Composite Cylindrical Roller Bearing Contact Fatigue Based on the Subsurface Stress

Table 5

Analysis of the results of subsurface equivalent stress.

Filling degree interval of elastic composite cylindrical roller	Variation trend of equivalent stress		Reason
	Depth change trend	Size change trend
40%-45%	Reduce	Reduce	With the increase of filling degree, the rigidity of elastic composite cylindrical roller decreases, the contact half width increases, and the stress values decrease.
45%-55%	Raise first and then lower	Raise first and then lower	The mechanical properties of the elastic composite cylindrical roller vary nonmonotonously from 45% to 55% of the filling degree, thus forming an inflexion point, so there is a peak value of the equivalent stress region on the subsurface.
55%-70%	Reduce	Rise	With the increase of filling degree of elastic composite cylindrical roller, the stress of bearing material under load has exceeded its limit, so the equivalent stress of subsurface presents a monotonous upward trend. The maximum equivalent stress of filling degree in this range is basically on the surface of the elastic composite cylindrical roller, mainly due to the excessive filling and the increased flexibility.