Abstract
Under across-column uniaxial and biaxial compression loading of columnar ice polycrystals in the brittle regime, a set of cracks that split the columnar grains has been observed. However, both the mechanism responsible for their nucleation and a quantitative description of the stress associated with such events have remained unresolved in the literature. In this paper, we first show that the nucleation of such cracks is consistent with the sliding of grain facets along the column axes, and then describe a fracture mechanics-based model that correctly predicts their nucleation stress.
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