Author(s): E. T. Gratz; E. M. Schulson
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Keywords: No Keywords
Abstract: Proportional loading experiments have quantified the brittle compressive strength for both fresh-water and salt-water columnar (S2) orthotropic ice at -10°C when loaded at a strain rate of 6x 10-3 s-1. For both materials, strength increases with confinement, in accord with Coulomb behavior and with the frictional sliding crack-wing crack mechanism of brittle compressive failure. The strengths of both materials are similar and show a similar dependence on the direction of the principal load, applied either perpendicular to or parallel to the columnar direction, and to the level of confinement applied either across and along the columns or in both across-column directions, respectively. Both materials fail through macroscopic faulting when triaxial compression is applied.
Year: 1998