Numerical Analysis Of Thermoplastic Deformation And Stress Of Steel

Flame correction is a hot processing technology widely used in steel finishing and steel structure deformation correction work.Because of its simple equipment,easy operation and good results,it is welcomed by the majority of front-line technicians and workers.However,there is still insufficient research and understanding on the thermoplastic mechanism of flame correction.This article takes flame correction as the engineering background,takes Q345 steel as the research object,combines the metal temperature field and the theory of thermoelastoplastic deformation,applies the thermo-mechanical coupling analysis function of the finite element analysis software ABAQUS,and uses the heat source subroutine DFLUX to analyze the The elastoplastic deformation process is numerically analyzed to try to reveal the thermodynamic and thermoelastoplastic deformation mechanism of flame correction process.First,establish a two-dimensional finite element calculation model of the plane,determine the required material parameters in the software with reference to the actual working conditions,select a typical calculation path,and analyze the distribution of temperature and displacement in the model with time and space.Time and space changes.On the basis of obtaining a large amount of data,the two kinds of yield stress(Mises yield stress and Tresca yield stress)and strain(elastic and plastic strain)during the thermoelastic plastic deformation process of the model are analyzed with time,space and temperature.The conditions and locations of the plastic zone are discussed.From the number of times the metal has plastic strain at different temperatures,the accuracy of the metal crystal recrystallization temperature at 450 ° C is verified.From the perspective of tensile and compressive stress,the causes of various points of plastic change are explained.Finally,a three-dimensional finite element model of space is established for numerical simulation.At different heating temperatures,the temperature field and the size of the plastic deformation region of the point and line heating mode models are compared and analyzed,and the residual stress distribution law is analyzed.To pave the way for the elimination of residual stress after correction.According to the method described in this paper,numerical simulation of flame correction for complex steel and structural deformation can be realized.The conclusions obtained in this paper provide reference data for the thermo-elastoplastic numerical analysis and technical optimization of metal materials,and have certain engineering reference value.