15th International Conference on Port and Ocean Engineering Under Arctic Conditions, 23-27 August 1999, Espoo, Finland
A series of beam bending experiments were conducted on sea ice using a high speed video camera (6000 frames/s) to capture the propagation of the fractures. Crack propagation was found to be intermittent and average velocities were lower than that reported for crack propagation in freshwater ice. Peak crack velocities ranged from 30 to 62 ms and average velocities for propagation through the entire beam ranged from 3.6 to 20.5 m/s. Fracture toughness and average crack velocity correlated positively. Analysis of thin sections from tested beams suggested that crustal grain structure inflienced the direction of crack propagation and may have contributed to the intermittent propagation behaviour.