Constant strain- and stress-rate compressive strength of columnar-grained ice

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Journal titleJournal of Materials Science
Pages785802; # of pages: 18
Subjectice; compressive strength; ice loads; strain; transversely isotropic columnar grained ice; closed-loop servo- hydraulic test system
AbstractUnconfined compressive strength of transversely isotropic columnar-grained ice has been investigated for loads applied normal to the longitudinal axis of the columns at the high homologous temperature of 0.96 T[m] (T[m] is the melting temperature) under truly constant strain and stress rates. A closed-loop, servo-hydraulic test system inside a cold room was used. The observed strain-rate dependence of strength was found to be the same as the dependence of viscous-flow rate on stress in constant stress creep tests at the same temperature. The strain-rate sensitivity of yield strength compares well with previous results only if the average strain rate to yield is used as the independent variable instead of the conventional nominal strain rate. The paper also discusses the strain and time aspects of the tests. It shows interdependence among values for compressive yield strength, strain rate, failure strain and time very similar to the interdependence among the corresponding values in tensile creep failures in metals, alloys and other polycrystalline materials at high temperatures. The splitting type of brittle-like premature failure depends on the stiffness of the test system and should not be considered a fundamental material property. The concept of failure modulus is proposed for examining the ductile to brittle transition.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number20341
NPARC number20375050
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Record identifier607339dd-e792-4532-966b-a2c09c16df77
Record created2012-07-23
Record modified2016-05-09
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