Formulation of Bearing Friction Torque in Threaded Joints With Nonflat Contact

Abstract

A novel experimentally validated formulation is provided for the bearing friction torque component in threaded joints with spherical and conical contact geometry, by extending two-dimensional Motosh model for various scenarios of contact pressure. Data for the corresponding effective bearing friction radius is generated, using constant or sliding speed-dependent friction coefficient models. Generated bearing friction radius data are used in Motosh model for torque–tension test data to obtain the bearing friction coefficient, which is found to be reasonably comparable to published bearing friction data.