Analysis of Crack Resistance of an Oil Trunk Pipeline Considering the Varying Failure Viscosity in the Neighborhood of a Welded Joint

Аннотация

This article presents a development of the method of analysis of crack resistance of an oil trunk pipeline in the zone of the transverse welded joint during operation. The nonlinear nonstationary heat conductivity problem was solved by the finite difference method using the boundary conditions of third kind. Modeling of the kinetics of conversion of austenite to ferrite and bainite under non-isothermal conditions during welding was carried out based on the theory of isokinetic reactions. The calculation of the residual welding stress is performed by solving the problem of thermoelastic plasticity using the finite element method for material with a nonstationary structure. The calculation of the crack resistance is based on Irwin’s force failure criterion, and the dependence of the failure viscosity on the structural composition is considered.