Author(s): Ernst Enkvist

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Abstract: Icebreaker designers should concentrate on improving the over all operative behavior of future designs. However, the confidence in operative ice model tests depends on the control and understanding of several physical phenomena in­volved. These must all be modelled properly in order to make the test meaningful. Experience with the fine grain model ice is exemplified and the basic principle of stiffness control explained. In spite of low uniaxial compressive strength the resistance to penetration is rather too high than too low. Several examples of full scale/model scale correlation in pure crushing as well as combined crushing and bending are presented. The state of art in friction control is sum­marized. Recent findings concerning propulsion experiments are presented. The conclusion is that the normal downward bending icebreaking process is satisfactorily modelled. Some cau­tion is necessary if much crushing is involved. Valuable information may be obtained from propulsion tests using nor­mal flexural strength scaling.

DOI:

Year: 1990