DETERMINATION OF THE TRIAXIAL DISTRIBUTION OF RESIDUAL STRESSES IN WELDED JOINTS OF STRUCTURAL ELEMENTS WITH RECTILINEAR SEAMS AND ESTIMATION OF THEIR INFLUENCE ON JOINT STRENGTH IN THE PRESENCE OF CRACK-TYPE DEFECTS

摘要

On the basis of a three-dimensional theory, we consider a mathematical model of a welded joint of plane structural elements with rectilinear seams. These joints are simulated by a plane layer with rectilinear seam with residual stresses. Using the method of direct integration of key equations without additional potential functions, we obtain expressions for components of the stress tensor for a set of given inconsistent residual strains localized in the weld. We investigate the influence of residual stresses on the static strength of this welded joint with sharp defects simulated by external surface cracks. Using a two-parameter criterion for brittle-ductile fracture, we calculate the load factors for a welded joint with a crack in the weld.