2025/07/10 by Lund, Jorrid, Sapp, Lina, Kubiczek, Jan Manuel +2
#Computational mechanics #Environmental Engineering::624.1: Structural Engineering #Floe-ice breaking #Ice-load spectrum #Mechanical properties of polar ice #Mohr-Columb nodal split #Propeller-ice interaction #Ships in ice #Technology::620: Engineering::620.1: Engineering Mechanics and Materials Science::620.11: Engineering Materials #Technology::623: Military Engineering and Marine Engineering #Technology::624: Civil Engineering
paper · doi:10.15480/882.15365
A methodology to better estimate the loads of ice acting on the propeller of a ship is developed. Based on measurements conducted in the North Pole region, an existing failure model for ice based on the Mohr–Coulomb nodal split approach is modified to better represent the lower strength of polar ice compared to laboratory ice. The modified material model for the sea ice is used to compute the propeller torque and a load spectrum for the propeller-ice interaction of the research ship S.A. Agulhas II. To this end, a floe-ice breaking simulation is used to estimate the size and shape of the ice cusps hitting the propeller of this ship. In the next step, a set of finite element simulations of the propeller-ice interaction utilizing the modified Mohr–Coulomb nodal split model is conducted. Based on this, the load spectrum is computed and compared with the measured torque on the propeller shaft of the S.A. Agulhas II. The successful reproduction shows the applicability of the approach to better estimate the loads exerted by the ice on the propeller.