Document Type
Article
Publication Date
1990
Publication Title
Journal of Glaciology
Department
Thayer School of Engineering
Abstract
Tensile tests have been performed onnotched and unnotched cylindrical samples of randomlyoriented polycrystalline ice of controlled grain-size (between2.2 and 7.3mm) at a loading rate of lOOPaS-l and at a temperature of -10 0c. In the notched samples, the notch-root diameter was 80% of the base diameter. Anotch-strengthening effect was observed in the large-grained ice, with fracture stresses being up to 50% higher than that for unnotched samples of the same grain-size. This notch-strengthening effect diminished as grain-size decreased, disappearing at a grain-size of "'3 mm. The notch-strengthening effect is explained in terms of the triaxial stress constraint at the notch root. This triaxialconstraint results in a change in the controlling mechanismof fracture from crack propagation in the unnotchedsamples to crack initiation in the notched samples.
DOI
10.1017/S0022143000005621
Dartmouth Digital Commons Citation
Nixon, Wilfrid A. and Schulson, Erland M., "A Notch-Strengthening Effect in Fresh-Water Ice" (1990). Dartmouth Scholarship. 2505.
https://digitalcommons.dartmouth.edu/facoa/2505