Author(s): Stephanie E. Buck; Oleg Y. Nickolayev; Erland M. Schulson
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Abstract: Biaxial compression experiments have been performed on laboratory-grown S2 columnar freshwater and saline ice plates at -10C. The role of brine and air pockets in ice under varying confinement on the ductile-brittle transition strain rate and on the failure envelopes is discussed. Evidence is presented of only minimal effects of the pores on the character of the ductile-brittle transition behavior. as indicated by first a rise in the transition strain rate as the confinement ratio increases from 0 to approximately 0.3. and then by a gradual decrease in this rate as the confinement ratio is increased from approximately 0.3 to 1, for both types of ice. The main difference found in the transition behavior for the two types of ice is that the transition strain rate for a given confinement ratio is approximately an order of magnitude lower in freshwater ice than in saline ice. For both types of ice, the failure envelopes have a semi-elliptical shape. with the length and width of the envelopes increasing with increasing strain rate.
Year: 1994