The functional features of the CDM-based damage constitutive model for stress relaxation which has been recently proposed were analyzed. Due to the highly nonlinear hyperbolic sine function adopted in the function and the large difference in the orders of magnitude among the material constants, an efficient genetic algorithm based optimization scheme was applied to obtain the global minima for the least square function. In addition, a procedure for the preliminary evaluation of material constants in the model was developed to better converging to the minima. The user-defined subroutine implementing the damage constitutive model was developed. It is validated that the predicted result provided by the developed ANSYS program agrees well with the experimental data of the stress relaxation for ferritic steels, providing preliminary results for the prediction of reheat cracking.

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