Strain Gradient Influence on Brittle Failure of Ice
Publication: Journal of Cold Regions Engineering
Volume 4, Issue 4
Abstract
Eccentric and concentric unconfined compression tests are conducted to examine the influence of strain gradients on the brittle failure of ice. Fresh‐water columnar‐grained ice specimens are tested at a temperature of and average strain rates of approximately Considering the strain varies linearly across a specimen, the stress distribution is determined from conditions of equilibrium of forces and moments. At failure, the average stresses for eccentrically loaded specimens are usually less than those for concentrically loaded ones. In the case of eccentrically loaded specimens, however, local stresses at some point along the specimen's width (usually one of the sides) reach a maximum value exceeding the average stress for a concentrically loaded specimen. Measured failure stresses show some scatter, which is commonly observed for brittle failure. Nonetheless, the maximum local stress reached in a specimen appears to increase with increasing strain (or stress) gradient. The maximum stress‐strain gradient dependence provides an explanation of the apparent size effect on ice failure stresses.
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Information & Authors
Information
Published In
Journal of Cold Regions Engineering
Volume 4 • Issue 4 • December 1990
Pages: 179 - 191
Copyright
Copyright © 1990 ASCE.
History
Published online: Dec 1, 1990
Published in print: Dec 1990
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