Abstract
In this paper results are presented from experiments to measure KIc the critical stress intensity factor, at -4, -11, and -24°C. Rectangular bars with a slot ending in a sharp crack in one side were broken in four point bending. The mean values were 118 ± 32 kN m-3/2 (44 samples) at -4°C, 119 ± 34 KN m-3/2 (40 samples) at -11°C, and 108 ± 21 KN m-3/2 (44 samples) at -24°C. These agree well with the results of other studies, and show that G, the strain energy release rate is close to twice the surface energy, Γ (overall mean for KICis 115 KN m-3/2, implies G equals 1.38 Jm-2 compared to 0.2 Jm-2 for 2Γ.
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