Author(s): Majid Kermani; Masoud Farzaneh
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Abstract: Fracture toughness of atmospheric ice accumulated in a closed loop wind tunnel at -6, -10 and 20 oC with a liquid water content of 2.5 g/m3 was examined at different strain rates. Ice samples accumulated at each temperature level were tested at the accumulation temperature, but the ice accumulated at -10 oC was also tested at -3 and -20 oC. The results of these tests show that fracture toughness of atmospheric ice decreases with decreasing accumulation temperature. This value for the ice accumulated at -10 oC and tested at the same temperature is 111.17 KPa m, which is in good agreement with the values reported by other researchers. The fracture toughness of atmospheric ice accumulated at -10 oC and tested at -20 oC increases, owing to higher strength at very cold temperatures. The fracture toughness of atmospheric ice accumulated at -20 oC and tested at its accumulation temperature is less than other types because the cavities and possible cracks in this ice decrease its crack propagation resistance.
Year: 2008