Calculating the Friction Force at Rest in Joints of Similar Hardness Assembled with Tightness

Abstract

The dependencies for determining the axial frictional force at rest in cylindrical joints assembled with a thermal tightness at different hardness ratios of the materials of the parts were investigated in this work. It is shown that the values of the friction coefficient may significantly differ depending on phenomena occurring in the contact of the microroughness of the mating rough surfaces of the parts. The obtained dependence for the determination of the friction force was experimentally proved. The application of the developed method for determining the friction force at rest allows reliable values of the bearing strength of the pressure joint to be obtained and reveals the unused reserves of the bearing strength. The developed method may be used in the design of pressure joints.