Abstract
In the present paper, the material behavior characteristics of fresh ice, such as material failure as well as constitutive behavior, have been evaluated based on the viscoplastic-damage mechanism. Ice is considered as one of the most complex materials in nature since it has various amounts and sizes of grain boundaries. The material behavior also significantly differs between the quasi-static and dynamic strain rates, namely, it has ductile and brittle material characteristics, respectively. In particular, the ice behavior under quasi-static strain rate is more complicated than under dynamic strain rate due to its ductile behavior, strain softening phenomenon, etc. Therefore, in the present paper, the unified viscoplastic model has been adopted to describe this phenomenon of ice under quasi-static strain rate. The material failure phenomenon of ice under compressive loading has been evaluated to avoid the fraction growth damage mechanism. The ratedependent viscoplastic-damage model has been implicitly formulated and implemented to the ABAQUS user defined subroutine to simulate the ice failure quantitatively. In order to validate the proposed analysis method, the simulation results of ice failure have been compared to a series of compression tests of ice.