IUTAM Symposium on Scaling Laws in Ice Mechanics and Ice by Ronald Greeley (auth.), J. P. Dempsey, H. H. Shen (eds.)

By Ronald Greeley (auth.), J. P. Dempsey, H. H. Shen (eds.)

This quantity constitutes the court cases of the IUTAM Symposium on 'Scaling legislation in Ice Mechanics and Ice Dynamics', held in Fairbanks, Alaska from thirteenth to sixteenth of June 2000. Ice mechanics bargains with primarily intact ice: during this self-discipline, descriptions of the movement and deformation of Arctic/ Antarctic and river/lake ice demand the improvement of bodily established constitutive and fracture types over a massive variety in scale: 0.01 m - 10 km. Ice dynamics, nevertheless, bargains with the move of damaged ice: descriptions of an combination of ice floes demand exact modeling of momentum move throughout the sea/ice process, back over a massive variety in scale: 1 km (floe scale) - 500 km (basin scale). For ice mechanics, the emphasis on lab-scale (0.01 - half m) learn con­ trasts with functions on the scale of order 1 km (ice-structure interplay, icebreaking); many vital upscaling questions stay to be explored.

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3 64 This process continues until the full pressure/area or load per width curves are determined for the entire full width of the structure. The results of this exercise for the SSDC/MAT are presented in Figure 10 and Figure 11. Figure 10 also includes local ice pressures derived for a wide structure located in the Chuckchi Sea in 30 m of water. A very interesting feature is the difference between the local design criteria derived from all the ice pressure data or only the ship, and structure ice pressure data excluding indentation test results.

1990 large scale indentation tests). However, since the ice characteristics may be different from one location to the other, the variation in the results may be within the accuracy of the indentation test measurements. Because of the need for the design to account for the aspect ratio, the following equations were derived for different ranges of contact areas (Table 5). For full ice thickness interactions, the aspect ratio plays a critical role in determining ice loads. ---- ~ w/h = 1 ....................

R----:---+' ~t ". ~ !. 1 ~ l-L ·9 ·· . 0 200 Pressure vs. 0 28 26 2' . a.. ~ :;'" 22 Blenkam 20 Peyton 18 ,6 ,. "' e"'"' ,2 a.. 0m Pile '0 oe os o. 0 0 Area 1m2) • Blenkarn Data Figure 5 X Peyton Pile Tesl Pressure vs. 3 37 Pressures on Wide Structures As indicated in the introduction to this paper, measurements of forces on structures with large aspect ratios have shown little relationship between the actual aspect ratio and ice crushing pressure but have shown that the pressure decreases as the ice thickness increases.

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