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Rolling Contact Fatigue Tests to Investigate Surface Initiated Damage and Tolerance to Surface Dents Pages: 19 Published: Jan 2002
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View License Agreement Source: STP1419-EB Abstract The improvement in steel cleanliness has resulted in a large reduction of subsurface damage initiated on inclusions. As a consequence surface initiated failure related to lubricant contamination has become the main cause of damage in most commercial applications. Debris contaminants can produce dents on the raceways, which generate stress concentrations, leading to failure. This paper describes experimental procedures developed to study the surface initiated damage mechanisms using two types of pre-damaging processes to simulate debris contaminant effects. - dents printed on the raceway using a diamond indenter, - natural dents obtained using a lubricant contaminated by fine hard particles Three-dimensional surface topography was used to characterise dent morphology and to compare the influence of materials. The test results show that the pre-denting method using hard powder is more efficient to reproduce surface morphology and damage mechanisms observed under practical operating conditions.
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