摘要：This paper discusses a constitutive model for large strain viscoplasticity
implemented in a model based on hyperelasticity. Viscoplasticity is derived
in the context of Perzyna model, based on an extended yield criteria proposed
originally by Ponthot. In the paper details of large strain
viscoplastic model based on hypoelasticity, implemented in the code Metafor,
are presented for comparison purposes. The hyperelastic large strain model
extended to viscoplasticity has been implemented in Sogde following a
previous work of the authors. Numerical problems in small strain case as well as
large strain conditions have been tested. Viscoplastic solutions recover
limit elastic and elastoplastic cases with both codes. The results obtained
with both codes are practically identical for the small strain problem tested.
For the large strain case both codes agrees well for limiting cases, but some
differences in the load level attained for intermediate values of viscosity
are found.
关键词：Viscoplasticity, large strains, numerical simulation.
