Notch sensitivity of first-year sea ice

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Journal titleJournal of Engineering Mechanics
Pages13031313; # of pages: 11
AbstractTests were carried out in Resolute NWT, Canada, (74 degree 43 prime N, 95 degree 04 prime W) on first-year sea ice to determine for the first time the notch sensitivity of first-year sea ice. A displacement feedback control was used on a soft portable testing frame to apply a calculated strain rate of 10 super minus super 3 s sub minus sub 1 at the extreme tensile fiber of the beam. An ice beam 0.1 m multiplied by 0.1 m in cross section, 1.0 m long was loaded in four-point bending, the constant moment region was 0.5 m long. In this region three identical cracks were prepared with lengths of 0 to 50% of the thickness of the beam. Beams with prepared cracks 1.5 mm long fractured at sites other than a prepared crack in nine out of 16 samples. In the 81 other beams, the crack initiated in the first prepared crack 29 times, in the second 32, and in the crack last sharpened, 20 times. The nominal failure strength was calculated using the unbroken ligament as the thickness, and it dropped to one-half the tensile strength at a/w equals 0.25, but the fracture toughness did not drop from 190 kNm super minus super 3 super / super 2 to 124 kNm super minus super 3 super / super 2 until a/w equals 0.5.
Publication date
AffiliationNRC Institute for Ocean Technology; National Research Council Canada
Peer reviewedYes
NRC number5196
NPARC number8895790
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Record identifierf9af463d-56e1-4e16-b660-b23e647cc185
Record created2009-04-22
Record modified2016-05-09
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