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SUMMARY:Rapid Healing of Thermal Cracks in Ice - Erland Schulson (Dartmout
 h College)
DTSTART:20220926T143000Z
DTEND:20220926T150000Z
UID:TALK178370@talks.cam.ac.uk
DESCRIPTION:The combination of thinning ice cover\, increasing wave amplit
 ude owing to increasing oceanic fetch\, and damage induced through diurnal
  thermal cycling threatens the structural integrity of the ice cover on th
 e Arctic Ocean. Of interest\, therefore\, is the strength of thermally dam
 aged ice. With that in mind\, new lab experiments were performed in which 
 thermal cracks were introduced into beams of sea ice\, lab-grown saline ic
 e and freshwater ice. Subsequently\, the ice was bent to failure. The crac
 ks initially weakened the materials\, in accord with fracture mechanics. H
 owever\, within a short period of time--tens to hundreds of seconds-- the 
 strength completely recovered to the level of non-cracked ice. The cracks 
 had healed. Healing is attributed to sintering as opposing faces come into
  contact upon warming\, assisted possibly by the presence of a quasi-liqui
 d-layer of the kind that accounts for Faraday's observation (1860) of imme
 diate bonding when two pieces of ice were placed in contact. Rapid crack h
 ealing may lessen the threat to the integrity of the ice cover.
LOCATION:Seminar Room 1\, Newton Institute
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