単結晶氷および多結晶柱氷の破壊じん性

概要

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Fracture toughness of single crystal ice and columnar grained polycrystal ice was investigated using sharply edge-notched specimens by three point bending at -10℃. The loading rate Kr ranged from 1.0 to 3.8×104 kPa･ml/2/s. The notch of the specimens was made by pressing the edge of a razor blade on the bottom of the saw cut slot. Three types of single crystal ice specimens were made, in which C-axis of the crystal placed at an angle θ equaled 0°, 45° or 90° with the notch plane respectively. Experimental results show that the effects of Kr on the fracture toughness is very little in the range Kr>30 kPa . m1/2/s. The results of the study of the experimental data in the range KI> 30 kPa･m1/2/s are summarized as follows; (1) KIf values of θ=0o and θ=90° specimens are nearly equal, and they are higher than that of θ=45° specimens. (2) Fracture toughness of columnar grained polycrystal ice specimens calculated from the KIf data of the single crystal ice specimens based on the weakest point theory was higher than that of the experiment.
長崎大学工学部,Faculty of Engineering, Nagasaki Universityの論文