Strain-Stress Model for A517Q in the Case of Small Deformation in Heating Process

In order to use finite element to accurately calculate the stress distribution for A517 Qslab in the heating process,a mathematical model was proposed to represent the true strain-stress curves for A517 Q steel at varying temperatures.Experimental data of tensile and expansion tests were applied to obtain the true stress versus mechanical strain at different temperatures,so as to exclude the influence of thermal expansion and oxidization.The mathematical model was based on five key parameters which could be obtained from the true strain-stress curve.This model was adaptive to simulating monotonically strain-stress curves without a yield plateau.In application,these five parameters were regressed as the functions of temperature,so that the strain-stress model at any temperature can be obtained conveniently.The model was further embedded in finite element code to analyse the stress distribution of A517 Qslab in the heating process.