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SUMMARY:Discrete Element Simulation of Ice-Structure Interaction - Jukka T
 uhkuri (Aalto University)\; Arttu  Polojarvi (Aalto University)
DTSTART:20171110T113000Z
DTEND:20171110T123000Z
UID:TALK94840@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Sea ice load on a marine structure is caused by the failure pr
 ocess of an ice feature against the structure. This failure process is aff
 ected by both\, the structure and the ice\, thus it is commonly called an 
 ice-structure interaction process. Some ice failure processes comprise of 
 large numbers of discrete failure events\, which lead to formation of pile
 s of ice blocks. Such failure process can be effectively studied by using 
 the Discrete Element Method\, DEM. As an example\, when a continuous sea i
 ce sheet is driven by the wind and current against a marine structure\, th
 e ice sheet gradually breaks into discrete blocks\, which interact with ea
 ch other and with the structure\, and form a rubble pile against the struc
 ture. Our recent DEM simulations show that the force from the pushing ice 
 sheet is transmitted to the structure through the rubble pile with chain-l
 ike groups of highly loaded ice blocks\, force chains. The existence of fo
 rce chains highlights the granular behavior of ic e rubble and calls for m
 odels that account for individual ice blocks. Other important problems whe
 re discrete ice blocks and their interactions have key roles\, are the str
 ength of sea ice ridges and rubble fields\, and the interaction of ships a
 nd structures with ridges and rubble piles.
LOCATION:Seminar Room 1\, Newton Institute
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