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Scale and rate effects in fracture of warm freshwater ice

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SIPW05 - SIP Follow on: Mathematics of sea ice in the twenty-first century

Large scale aboratory experiments on size and rate effects on the fracture of warm columnar freshwater ice have been conducted with floating edge-cracked rectangular plates. The largest test plate had dimensions of 19.5m x 36m. The experiments covered a size range of 1 : 39 , possibly the largest for ice tested under laboratory conditions. The thickness of the ice plates was about 0.4m and the temperature at the top surface about -0.3 C. The size and rate effects were observed to be interrelated: There was a size effect at low rates but no size effect at high rates. There was a rate effect for the larger test sizes but a weaker or no rate effect for the smallest test size. In addition to the fracture tests were the load was monotonically increased, also creep/cyclic-recovery tests were conducted with 3m x 6m ice plates. The ice response was elastic–viscoplastic; no significant viscoelastic recovery was detected. This is different than in earlier experiments and the possible contributing factors include the very warm, floating freshwater ice used and the large sample size, larger than in the earlier studies. The talk summarises the work by Gharamti, Dempsey, Polojärvi and Tuhkuri, recenly published in Acta Materialia and The Cryosphere.

This talk is part of the Isaac Newton Institute Seminar Series series.

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