Abstract
In order to obtain experimental data to investigate the mechanism of crack initiation and propagation, an innovative rolling contact fatigue (RCF) machine was developed. Compared to the conventional thrust type RCF machine the new device enables more efficient RCF testing and observation of subsurface cracks. Experimental data and information on inclusions and micro-cracks were obtained through observation by a laser confocal microscope and comparison with stress analysis. The depth of detected crack initiation is strongly correlated with the stress distribution.
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