Free Beam Tests and Friction Tests at Pond Inlet, N.W.T.

The flexural strength and elasticity of the sea ice cover is determined by testing free beams extracted from vartous depths wi th in the ice. The dependence on orientation and s ample d imenslons is investigated. The surface fr ictlon coefficient of ice against steel is measured with a small sledge. The influence of surface roughness and pressure is investigated. Zusammenfassung: Biegefestigkeit und Elastizitat des Meereises werden untersucht durch das Entnehmen von Eisbalken aus verschiedenen Eis tiefen. Die Beziehung zwischen Festigkeit, Entnahmetiefe und BalkenahmesBungen wird uberpruft, der Reibungskoeffizient zwischen Eisoberflache und Stahl mit einem kleinen Schlitten gemessen und der Einflus der Rauheit der Oberflache und des Andrucks festgestellt. l titroductiori A. G, "Weser" contracted with Wartsila Helsinki Shipyard to perform free beam tests and surface friction tests in connection with the EOS-72 routing study. The tests were made during May and June 1972 on the sea ice of Eclipse Sound outside Pond lnlet, N, W, T, as part of a joint Canadian Gennan expedition to investigate the sea ice conditions, The purpose of these tests was to measure the strength of the ice cover and the friction coefficient of the ice surface against steel in order to obtain information needed for the evaluation of the ships resistance in ice. To avoid the heavy equipment necessary for the cantilever beam tests in 1.8 m thick ice, it was decided that the subject of the tests would be medium-sized (1.5 m x 0,2 m x 0,2 m) free beams which were extracted from the ice cover with chain saws. Fig, 1: The apparatus for breaking the beams. Abb. 1: Zum Brechen der Eisbalken benutzte Anlage, • Dipl.vlnq. Kari Airaksinen, Naval Architect, Wartsila Helsinki Shipyard, Helsinki, Ptnlend.