Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 52 8 2019 05 27 Investigation on the Effect of Pressure and Radius of Contact Surface Curvature on the Friction Coefficient in Contact Surfaces of Interference Fit Joints Investigation on the Effect of Pressure and Radius of Contact Surface Curvature on the Friction Coefficient in Contact Surfaces of Interference Fit Joints 2123 2134 3447 10.22060/mej.2019.15509.6143 FA Kaveh Abbasi Department of Mechanical Engineering, Islamic Azad University, Eslam Abad-E-Gharb, Kermanshah, Iran 0000-0003-4950-0965 Hazhir Ehsasi Department of Mechanical Engineering, Islamic Azad University, Kermanshah, Iran Journal Article 2018 12 26 Interference fit joints are widely used to produce tight joints. Interference fit joints could be applied under dynamics and statics design loads, successfully. Interference fit joints are always imperfect and also affected by some parameters which directly affect the operation of these joints. For instance, the contact surface of every manufactured joint part is not a perfect cylinder and always there are some form defects. The variation of these parameters could affect the performance and strength of interference joints, so these parameters should be considered. Some effective parameters on the strength of interference fit joints are friction coefficient, roughness, materials properties, dimensions and geometric irregularities of contact surfaces. In this study, the effect of diameter of shaft and interference value variation on the friction coefficient in contact surface and strength of joints are investigated. Finite element results are interacted with experimental ones to estimate friction coefficients. Also, factorial method, which is a statistical method for design of experiments, is used to analyze the effects of pressure, which is vary by variation of interference, and radius of contact surface curvature on friction coefficient and strength of joints. Results indicate that the friction coefficient changes with diameter of interference surface, inversely and increase of interference and consequently, pressure leads to growth of friction coefficient. Interference fit joints are widely used to produce tight joints. Interference fit joints could be applied under dynamics and statics design loads, successfully. Interference fit joints are always imperfect and also affected by some parameters which directly affect the operation of these joints. For instance, the contact surface of every manufactured joint part is not a perfect cylinder and always there are some form defects. The variation of these parameters could affect the performance and strength of interference joints, so these parameters should be considered. Some effective parameters on the strength of interference fit joints are friction coefficient, roughness, materials properties, dimensions and geometric irregularities of contact surfaces. In this study, the effect of diameter of shaft and interference value variation on the friction coefficient in contact surface and strength of joints are investigated. Finite element results are interacted with experimental ones to estimate friction coefficients. Also, factorial method, which is a statistical method for design of experiments, is used to analyze the effects of pressure, which is vary by variation of interference, and radius of contact surface curvature on friction coefficient and strength of joints. Results indicate that the friction coefficient changes with diameter of interference surface, inversely and increase of interference and consequently, pressure leads to growth of friction coefficient. https://mej.aut.ac.ir/article_3447_2e1b24a664f5e9c18f407b2f9c73e821.pdf