Comparison of Results of Impact Tests on Laboratory and Natural Freshwater Ice with Hydrodynamic Model Predictions

摘要

An extensive series of drop impact tests were carried out by the Arctic and Antarctic Research Institute (AARI) on natural ice in the late 1960s and by the National Research Council of Canada (NRC) on laboratory ice in the late 1980s. Spherical impactors of radii 286 mm and 100 mm and masses ranging from 33 kg to 300 kg were used. Impact velocities ranged from 0.6 to 5.6 m/s. Measurements of accelerations of the impactor allowed ice resistance and penetration to be determined. The data from both test locations were analysed using the Kheisin and Kurdyumov "hydrodynamic model" of impact of a rigid body on ice. The "ice impact crushing strength", analysed by applying the "hydrodynamic model" to all the data, showed consistency and similar trends. Impact strength decreased with increasing velocity and increasing ice temperature. A velocity dependent "ice impact crushing strength" is suggested as a modification to the "hydrodynamic model".