Abstract
Experiments were performed to observe cyclic crack growth in S2 columnar freshwater ice and granular freshwater ice with randomly oriented grains. The ice was loaded in four-point bending such that the crack opened in a mode-I manner. A traveling microscope was used to measure surface crack growth and a low-powered laser was used to map crack growth along the entire crack front. Results of crack growth measurements together with micrographs of failure surfaces support a qualitative description of the failure mechanisms operable near the crack tip during cyclic loading.
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