Photoelastic tests have been performed to investigate the effect of spin on the contact stresses between rolling bodies. All the tests employed equal spheres, resulting in nominally flat, circular contact areas. The shear-stress distributions on such contact areas have been experimentally determined by the ‘frozen stress’ technique. One set of tests examined the case where no resultant surface force was transmitted between the spheres while they were rolling with spin. Another set of tests allowed a resultant force perpendicular to the rolling direction to be transmitted. The test results are compared with several theories.
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