Abstract
An elongated, uniaxial brass ice stress sensor has been developed by the University of Alaska and used in several field experiments. Laboratory calibration tests have been conducted, in a 60 × 29.5 × 8.5 in. (1524 × 750 × 216 mm) ice block into which the sensor was frozen, to determine the sensor’s response characteristics. Test results indicate that the sensor acts as a stress concentrator with a stress concentration factor of 2.4 and transverse sensitivity of −1.3 at stresses below 30 lbf/in2 (207 kPa). At stresses greater than 30 lbf/in2 (207 kPa) the stress concentration factor increased and the sensor exhibited a time delay response to load. Differences of 22 percent were measured between the measured sensor stress immediately after a constant ice load was applied and the asymptotic stress limit. Interpretation of measured sensor stresses can be considered reliable at ambient ice stress levels below 30 lbf/in2 (207 kPa).
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