Flexural strength of clear lake ice
Hitch, Robert D.
Technical ReportSummary: Values for the modulus of elasticity and strength of freshwater lake ice in flexure were determined by laboratory experiments on 63 beams tested under various rates of loading at -5°C and -20°C. The results were obtained by measuring the center deflection of the test beam and the load simultaneously. Third point loading was used in order to develop a more favorable distribution of bending stresses in the middle third of the beam than with a simple beam. The experiments indicate that properties of ice vary according to loading rate, temperature, and crystal size. Specifically the results show: (1) lower temperatures give higher values of the modulus of elasticity and strength, (2) ice with larger crystals will have a higher modulus of elasticity but little difference in strength, (3) the rate of loading increases the modulus of elasticity but has little effect on the strength except at low temperatures where higher strength values are obtained with a faster rate of loading.
U.S. Army Snow, Ice, and Permafrost Research Establishment.Engineer Research and Development Center (U.S.)
Lake ice; Ice; Flexural strength; Ice cover strength; Ice thickness; Elasticity; Temperature effects; Ice crystals; Ice crystal size
SIPRE report ; 65.
Approved for public release; distribution is unlimited.