A Method to Evaluate the Material Parameters of Viscoplastic Damage Uniform Constitutive Equations

The viscoplastic damage uniform constitutive model and the constant evaluation method are reviewed, and a new simple method is presented to determine the material parameters of viscoplastic damage uniform constitutive equations. Then the genetic algorithm is used to optimize the parameters of the directionally solidified alloy DZ4. This method is proved to be reliable by the calculated saturation loops and creep curves.