Abstract
The experimental method of caustics has been applied to rolling contact fatigue for determining the crack growth mechanism. Caustic images formed from stress fields under rolling contact with a crack are very complicated. Therefore, the theoretical background of the experimental caustic images formation has been studied through caustic image simulations. The simulation has been done by the scheme combining directly caustics method with boundary element method. The size and shape of simulated caustic images, which are formed from the contact region and crack tip in disk-on-disk rolling contact fatigue, was coincident with experimental caustic images. In the present paper, the computer program was extended to simulate not only caustic images but also their initial curves that are loci of points in the disk through where the light rays passed. This program is utilized to discuss the mechanism of damage formation in rolling contact fatigue and to examine experimental results.
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