Abstract
Lubricants are continually being subjected to increasing mechanical shearing forces. Consequently the interest in materials of variable viscosity has increased. The problem of a roller bearing lubricated by a Casson fluid, which is a shear thinning lubricant, has been investigated; the non-sliding steady state and the squeezed film situation have been studied. At high speeds the load capacity of the Casson fluid is equal to that for a Newtonian fluid of the same viscosity. At low speeds the difference is significant; the Casson fluid film has a load capacity even if the velocities of both cylinders in contact are zero.
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