An implicit formulation of the BodnerPartom constitutive equations
The framework for an implicit implementation of the BodnerPartom material model is presented. All equations needed for using a NewtonRaphson algorithm to solve the stress and hardening equations at the integration points are derived. In addition, the algorithmic tangential stiffness tensor, ensuring quadratic convergence in the global loop is presented.
implicit bodnerpartom integration algorithmic tangential stiffness viscoplastic