Microcracking and shear fracture in ice

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Journal titleAnnals of Glaciology
Pages131137; # of pages: 7
AbstractThe relationship between microcracking and ice strength has been examined using triaxial apparatus in which crack damage can be inhibited by the imposition of confining pressure. Shear fracture in ice is observed to be a rapid, unstable process with no apparent indication of tensile crack localisation or interaction prior to failure and non accompanying large-scale volumetric changes, at least to within 1 ms of the occurrence of macroscopic failure. Shear fracture strength displays little of no dependence on confinement at moderate pressures (P = 5-20 MPa), and there is no evidence of significant crack sliding before macroscopic fracture under these conditions. Where flow with distributed microcracking occurs, yield strength can also remain remarkably unaffected by confining pressure, despite reduced crack damage. Particularly under conditions where microcracks are induced by predominantly elastic strains, they may remain stable and non-interacting even at high volumetric densities.
Publication date
AffiliationNRC Institute for Ocean Technology; National Research Council Canada
Peer reviewedYes
NRC number6146
NPARC number8895735
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Record identifiera4ac085d-539d-4c7c-adf7-9adcacf38e14
Record created2009-04-22
Record modified2016-05-09
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