Modeling stress-strain state of welded joints of rolling stock supporting structures

Abstract

Welded structures should meet the requirements for strength and dynamic qualities established by the current regulatory and technical documents. Formation of a welded joint is a complex and non-linear physical process resulting in residual stresses that affect the fatigue and static strength of the structure in this zone, which determines the safety of the structure during operation. Nevertheless, there are no requirements for welded joint stress determining mechanisms. The purpose of this study is to determine the residual stresses in the area of a T-beam welded joint, most commonly used to connect elements of railway structures. A finite-element model of the platform frame structure was developed to study the stress-strain state, and virtual models of welded joints with simulation of the welding process of its parts connection were created.