Author(s): Sveinung Loset; Trond Kvamsdal
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Keywords: No Keywords
Abstract: The temperature of ice affects its mechanical strength properties. The strength decreases with increasing ice temperature. The ablation of the submerged body of an iceberg results in a steep temperature gradient reaching the core temperature about 3 m into the ice. The finite element discretization method has been used to study how the reduced strength of ice due to the raised temperature close to the surface of the underbody of the iceberg, affects the interaction force between a fixed platform leg and a colliding iceberg. A failure criterion for ice is discussed and the stress distribution within the ice in front of the contact rone is determined for different ice properties and indentation velocities. The results show that a change in the temperature from _10°C to - 2°C results in a 10 % reduced peak force and the impact period is increased.
Year: 1994