A procedure for determining the constitutive equations for materials exhibiting both time-dependent and time-independent plasticity

摘要: Abstract A procedure is given in order to determine various functions and constants entering a constitutive equation exhibiting both time-dependent time-independent plasticity, starting from set of experimental data. As typical experiments one has chosen the symmetric longitudinal impact two identical bars, since for such kinds problems great deal data are available. The unloading process also considered it mainly during that interesting aspects concerning “plasticity” may be put into evidence. “relaxation boundary” which plays main role plasticity introduced. Several computed examples show influence or equation.