STUDIES ON GENERALIZED MIDPOINT INTEGRATION IN RATE-INDEPENDENT PLASTICITY WITH REFERENCE TO PLANE-STRESS J(2)-FLOW THEORY

Issues related to use of the generalized midpoint integration in rate-independent plasticity are investigated restricting attention to plane stress J2-flow theory. Accuracy analysis is performed by developing the iso-error maps for a representative range of loading conditions and alpha-values utilized in the midpoint integration rule. Consequences of the discrete enforcement of the consistency condition on the numerical resolution of the boundary value problem are discussed. A numerical example is presented to test the influence of the choice of alpha-value on a global accuracy and effectiveness of the solution scheme.