The Coupled Deformation and Heat Flow Analysis by Finite Element Method During. Friction Welding

摘要

Temperature, stress and strain fields are three main physical parameters of friction welding. With the development of computer and numerical calculation, the theoretical simulation of these three fields has become one of the most important subjects in thermal processing technology, including friction welding. The present paper carries out the analysis of the coupled thermo-mechanical problem during friction welding by using finite element method, according to the constitutive relation of large elastoplastic deformation and the principle of the virtual work. The heat flow and stress-strain process at the heating stage of friction welding are simulated. The law of variation of temperature, stress and strain fields during friction welding is systematically investigated. Accordingly, the formation of the plastic deformation zone for the welded joint and the uneven distribution of the deformation degree are analyzed. The calculated results of temperature agree well with the experimental data obtained at some measurable points. The calculated axial stress distribution on the frictional surface at different instances is integrated to compare it with the measured results of the axial pressure and shows excellent fit between them.