An ice material model for assessment of strain rate, temperature and confining pressure effects using finite element method

Paper i proceeding, 2018

This paper addresses an investigation of ice constitutive laws modelling with strain rate, temperature and confining pressure effects to simulate the dynamic ice loads on ships and marine structures. For the proposed phenomenological model consisting of elastic, delayed elastic and viscous components, strain rate is taken into account by introducing a viscous term based on Glen’s law, and the compressive strength under different strain rates is analyzed. The effects of temperature and confining pressure are also included in the ice model. With the consideration that the viscous term and delayed elastic term are affected by temperature, the pressure hardening and pressure softening phenomena are embedded in the constitutive model. The proposed three-dimensional constitutive model is implemented in explicit LS-DYNA as a user-defined material model, and the numerical simulations are conducted to verify the proposed ice material model. Constant strain rate experiments and creep experiments using cylindrical ice specimens are selected for case studies. From which, ice strength and strain-time curves at different strain rates, temperatures and confining pressures are obtained and compared with experimental results.