Abstract
The paper describes some experiments, the object of which was to determine the stress distribution at a contact surface or below of it. Plastic and glass cylinders were rolled on the inner surface of a hardened steel ring under dry and lubricated conditions. The ring and the cylinder were driven by separate motors to enable rolling and sliding contact. The maximum pressure at the contact point was, according to Hertz theory, p 0 = 4300 psi for a plastic model and p 0 = 30,000 psi for a glass model. Direct comparison, for a given load, of isochromatic patterns for dry and lubricated conditions testify that the oil film exerts an influence on the stress distribution in the contact zone, the discrepancy with the Hertzian distribution being considerable.
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