Abstract
A state variable constitutive model for large deformation, isotropic thermo-elasto-viscoplasticity, and an implicit time-integration procedure to integrate the evolution equations for the state variables have been developed. The constitutive equations and time integration procedure have been incorporated into the general purpose finite element computer code ABAQUS via its “user material” subroutine option. By using this program, representative problems have been numerically analyzed. The predictions from the analysis concerning the forging load as a function of ram travel, and the overall shape changes are found to be in excellent agreement with measurements made in similar laboratory experiments.
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