Residual Stress Formation During Steel Tubes Expansion

Abstract

AbstractThe study of the process of forced radial deformation and subsequent elastic recoil of metal without mechanical impact on the tube is carried out. Such a process is possible if high-pressure liquid is supplied to the inner or outer surface of the tube. It is noted that under the action of internal pressure and in the absence of axial load, circumferential stresses develop in the sections, balancing forces that cause radial deformation of the tube. Based on the approximation of experimental data, a formula for determining circumferential stresses is obtained. In accordance with the accepted assumptions, a mathematical model is proposed, and an algorithm for modeling the process of radial plastic deformation of a tube under the action of internal fluid pressure is presented. In accordance with the assumptions made, a mathematical model is suggested and an algorithm of modeling the process of tube radial plastic deformation under the influence of internal fluid pressure is presented.KeywordsStressElongationTubeLayerElastic recoilHydraulic actionAlgorithm