Abstract
Contact pressure and displacements in a shaft and ring as a pair on interference fit having cylindricity error of axially symmetrical profiles are analyzed by means of finite element method (FEM) with some assumptions: the deformation of bulk material is elastic, roughness of fitting surface is negligible, and the frictional condition on the contact surface obeys Coulomb's law. The analytical results are as follows: (1) Mean contact pressure is almost constant when mean interference is equal and the profile errors are small comparing with it, although displacements and local contact pressure vary according to the change of profile errors. (2) When the contact between shaft and ring comes to break locally as the profile errors increase mean contact pressure can not be estimated by mean interference any more. It is necessary to modify the mean interference by the way of cutting the interference off where the shaft and ring separate. (3) There is no remarkable change of contact pressure and displacements by the change of the coefficient of friction, however there is a little change of them at the ends of fitting surface.
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