Development of incremental FEM based deformation model for continuous caster strand, incorporation of Aitken-Steffensen algorithm for fast computation and sensitivity analysis of constitutive parameters on the predictions of stress-strain

The knowledge of stress-strain field within the solidified shell is key to the understanding of crack formation as well as fracture of solid shell leading to operational breakout during continuous casting of steels. The stress-strain field is usually calculated by using the finite-element model that uses physical and constitutive properties of steel at elevated temperature as well as the thermal field in the strand. In the present work an incremental FEM based deformation model was developed for stress-strain calculations. The computation time was drastically reduced using Aitken-Steffensen algorithm. Further the predicted results were shown to be highly sensitive to elastic modulus and some of the constitutive parameters. It was thus suggested that experimentally generated stress-strain curves for a given alloy, at different temperatures and strain rates, should be preferred to simple constitutive equations.