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SUMMARY:Scale and rate effects in fracture of warm freshwater ice - Jukka 
 Tuhkuri (Aalto University)
DTSTART:20220926T123000Z
DTEND:20220926T131500Z
UID:TALK178364@talks.cam.ac.uk
DESCRIPTION:Large scale aboratory experiments on size and rate effects on 
 the fracture of warm columnar freshwater ice have been conducted with floa
 ting edge-cracked rectangular plates. The largest test plate had dimension
 s of 19.5m x 36m. The experiments covered a size range of 1 : 39 \, possib
 ly the largest for ice tested under laboratory conditions. The thickness o
 f the ice plates was about 0.4m and the temperature at the top surface abo
 ut -0.3 C. The size and rate effects were observed to be interrelated: The
 re 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 lo
 ad was monotonically increased\, also creep/cyclic-recovery tests were con
 ducted with 3m x 6m ice plates. The ice response was elastic&ndash\;viscop
 lastic\; no significant viscoelastic recovery was detected. This is differ
 ent than in earlier experiments and the possible contributing factors incl
 ude the very warm\, floating freshwater ice used and the large sample size
 \, larger than in the earlier studies. The talk summarises the work by Gha
 ramti\, Dempsey\, Poloj&auml\;rvi and Tuhkuri\, recenly published in Acta 
 Materialia and The Cryosphere.
LOCATION:Seminar Room 1\, Newton Institute
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