@DSL IsotropicPlasticMisesFlow;
@Behaviour LogarithmicStrainPlasticity;
@Author    Helfer Thomas;
@Date      5/12/13;

@StrainMeasure Hencky;

@ElasticMaterialProperties {210e9,0.};

@Parameter s0 = 250e6;
@Parameter Et = 1e6;

@LocalVariable stress R;

@InitLocalVariables{
  // hardening slope
  R  = young*Et/(young-Et);
}

@FlowRule{
  f       = seq-R*p-s0;
  df_dseq = 1;
  df_dp   = -R;
}