Abstract
Sea ice samples of Lake Saroma, Hokkaido, Japan, and Barrow Alaska were subjected to two uniaxial compression tests: the normal compression test and the fracture test in which a cyclically changing load was applied to a sample so that compression and stress relaxation were repeated between two fixed levels of stress until the sample fractured, the average of them being about 30% to 60% of the compressive strength. The latter test seems to be equivalent to the creep test in that the average stress is kept constant throughout the test. The duration of time for a sample to fracture decreased with an increase in average stress or temperature or both. In the latter test, although the stress in each compression process is small, the total amount of mechanical work for a fracture to take place is much larger than that by the former test.
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