Numerical analysis of ice blocks impact on stiffened plates accourding t a Mohr-Coulomb material and node splitting technique

Due to the surge of interest and use in Artic, much research has been done over the years on ice-interaction issues. A reliable ice material model is essential to study ice-structure interactions. The ice model in this analysis uses the Mohr-Coulomb mathematical model, which well expresses the behavior of brittle materials. In addition, the ice model was expanded using the node splitting technique to preserve mass and energy, in opposite to the commonly used element erosion technique. In this paper a numerical analysis of a collision between ice blocks with masses of around 100 kg and 600 kg and stiffened steel plates was carried out using the explicit solver LSDYNA R11.1.0. To validate the simulation, kinetic energy and maximum dent on stiffened steel plates were compared with experimental data performed at the Norwegian University of Science and Technology and the Aalto University. The impact speed is around 4 and 7 m/s, which is frequently observed in ship collisions with ice. As a result of numerical analysis, MCNS ice blocks with particularly high kinetic energy were analyzed to be consistent with the NTNU and Aalto experimental results. In terms of energy balance, it was consistent with previous study in which 20 to 30 % of collision energy was dispersed in the structure. This proves that MCNS ice model can be used to accidental limits scenarios.

Subjects

Arctic technology

Ice-structure Interaction

DDC Class

620: Engineering

Options

Numerical analysis of ice blocks impact on stiffened plates accourding t a Mohr-Coulomb material and node splitting technique