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

Table 4

Analysis of the results of subsurface shear stress.

Filling degree interval of elastic composite cylindrical roller	Subsurface equivalent stress		Reason
	Depth change trend	Size change trend
40%-55%	Rise	Raise first and then lower	With the increase of filling degree, the rigidity of elastic composite cylindrical roller decreases, the contact half width increases, the depth of subsurface shear stress also increases, and the shear stress varies irregularly.
55%-60%	Reduce	Rise	With the increase of the filling degree, the mechanical properties of the bearing materials show a nonmonotonic change. The filling degree of the elastic composite cylindrical roller reaches the peak at 55% of the subsurface shear stress depth, the stress value is not large, and the stress continues to increase.
60%-70%	Rise	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 subsurface shear stress presents a monotonous upward trend.