Author(s): Marco Nanetti; Aleksey Marchenko; Knut V. Hoyland
Linked Author(s): Knut Hoyland
Keywords: No keywords
Abstract: A device was developed and designed and small scale laboratory experiments were carried out to study sea ice frictional interaction with steel material by means of a uniaxial compression rig. Sea-ice was artificially grown between a stainless steel piston (of circular cross section) and a hollow cylinder of the same material, coaxial to the former and of the same surface roughness. Three different values for the roughness were tested: 1.2, 10 and 30 um Ry (maximum asperities height), chosen as representative values for typical surface conditions, from smooth to normally corroded steel. Creep tests (0.2, 0.3, 0.4 and 0.6 kN) were conducted at T = -10 ºC. By pushing the piston head towards the cylinder base, two different types of relative movement were observed: 1) the piston only slid through the ice, 2) the piston slid through the ice and the ice slid on the surface of the outer cylinder. A cyclic stick-slip motion of the piston was detected with a representative frequency of 0.1 Hz. The ratio of the mean rate of axial displacement to the frequency of the stick-slip oscillations was comparable to the nominal roughness length (Sm). The roughness is the most influential parameter affecting the amplitude of the oscillations, while the load has a relevant influence on their frequency. Guidelines for further investigations were recommended.
Year: 2008