Constitutive modeling of cyclic plasticity and creep, using an internal time concept
(From author's summary.) Authors use the concept of an internal time as related to plastic strains, and rederive the differential stress-strain relation for elastoplasticity, such that (i) the concept of a yield- surface is retained; (ii) the definitions of elastic and plastic processes are analogous to those in classical plasticity theory; and (iii) its computational implementation, via a ''tangent-stiffness'' finite element method and a ''generalized-midpoint-radial-return'' stress- integration algorithm, is simple and efficient. Also, using the concept of an internal time, as related to both the elastic strains as well as the Newtonian time, a constitutive model for creep-plasticity interaction, is discussed. The problem of modeling experimental data for plasticity and creep, by the present analytical relations, as accurately as desired, is discussed. Numerical examples which illustrate the validity of the present relations are presented for the cases of cyclic plasticity and creep.
differential stress-strain relation for elastoplasticity
tangent-stiffness'' finite element method
''generalized-midpoint-radial-return'' stress-integration algorithm
constitutive model for creep- plasticity interaction
scientific article; zbMATH DE number 4003624