Characterization of material parameters used in the mathematical modelling of arc welding and heat treatment processesUrevc, Janez (Avtor) Koc, Pino (Avtor) Štok, Boris (Avtor) material propertiesmodelling simmulationprocess simulationsresidual stressesMathematical modelling of thermo-mechanical processes, such as welding and heat treatment processes, requires the choice of an appropriate material constitutive model on one hand and the use of a consistent set of material parameters on the other. However, possible untrustworthiness of the material parameters contained in the adopted constitutive model, in particular regarding their dependence on temperature, could significantly impact the physical objectivity of the obtained numerical results. Despite the fact that the accuracy of a constitutive model increases with the number of considered material parameters in general, the analyses performed in this paper are based on a relatively simple, but still adequate elastic-viscous-plastic constitutive model. First, by an inverse numerical procedure the temperature-dependent thermal and mechanical material parameters are identified from given experimental data for an austenite stainless steel 316L (AISI). Second, the adequacy of the adopted model and identified material parameters is shown by simulating numerically a threepass butt welding experiment where good agreement between the calculated results and data from the literature is found. Lastly, annealing of the welded plate for residual stress relief was simulated numerically. The obtained reduction in residual stresses is found to be in agreement with the amount of the residual stress reduction provided from literature. The appropriateness of using a viscous power constitutive law and the adequacy of the presented material characterisation procedure in the modelling of thermo-mechanical processes is demonstrated.20112024-09-17 09:48:22Članek v reviji161943UDK: 52-334.2:621.791ISSN pri članku: 1333-1124COBISS_ID: 12226587sl