Crack formation in ice plates by thermal shock

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Journal titleCanadian Journal of Physics
Pages17121718; # of pages: 7
Subjectice; temperature cracks; thermal shocks; axial stresses; internal stress distribution
AbstractCracks were formed in the surface of smooth ice blocks by bringing them into contact with a second colder ice block. The temperature change within each block and the associated thermal stress were calculated. The ultimate strength of a smooth ice surface was found to be between 30 and 40 kg/cm[ 2]. The surface temperature shock necessary to produce this stress was about 6 degrees C. There was a marked preference for the cracks to form parallel to the basal and prismatic planes. Maximum depth of crack penetration was obtained with ice blocks made up of only one or two crystals with their C axis perpendicular to the surface. The minimum observed value for the strain energy release rate at crack arrest was calculated to be between 150 and 200 ergs/cm[2] for each cm[2] of new crack surface, indicating that for the crystallographic orientation and stress distribution of those experiments there was relatively little plastic deformation at the crack tip. The associated crack edge stress intensity factor was between 3.0 X 10[6] and 3.5 X 10[ 6] dynes cm[-3/2].
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number7548
NPARC number20375024
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Record identifierb022c819-e6d8-4841-91cc-644c97233817
Record created2012-07-23
Record modified2016-05-09
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