• A unified viscoplastic model for the inelastic behavior of ice

      Dasari, Jeevana (2006-08)
      A physics-based SUVIC-I model is proposed for the ductile region of polycrystalline ice. It accounts for mixed hardening and directional softening using the three internal state variables - back stress, yield stress and drag stress. The main objective is to provide the best suitable material parameters for this model. The process to obtain these parameters is discussed in detail. The computational aspect of this model is implemented in the finite element program ABAQUS through a user subroutine UMAT for the axisymmetric and 3D models. The results are validated against the experimental data for constant strain rate and creep tests.