The Failure Process in Columnar-Grained Ice

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TypeTechnical Report
Series titleTechnical Paper (National Research Council Canada. Division of Building Research); no. DBR-TP-369
Physical description164 p.
Subjectice; crackings (breaking); creep; strain; fissuration; fluage; deformation
AbstractInformation is presented on the stress, strain, temperature and time dependence of crack formation in columnar-grained ice. It was observed that cracks began to form during creep when the constant compressive stress exceeded about 6 kg/cm[ 2]. For stresses less than about 10kg/cm[2], the cracking activity was confined mainly to the primary creep stage. When the stress was greater than about 12 kg/cm[2], crack formation brought on the failure condition before the secondary creep stage could be established. It is shown that before the onset of failure, the cracking activity was essentially random, and probably involved two independent processes--one with a probability of crack formation dependent on the strain, and one with a probability independent of the strain. Observations are presented on the probability distribution for crack density, width and orientation. The possible effect that modes of deformation and recovery might have on the temperature and strain dependence of the cracking activity is discussed.
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PublisherNational Research Council Canada
AffiliationNational Research Council Canada
Peer reviewedNo
NRC numberNRCC 12637
NPARC number20374648
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Record identifier002e6a67-72d4-4839-8eae-b0a3abbb5875
Record created2012-07-23
Record modified2017-06-29
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