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As shown in the previous study on the corner fracturing in rock which was reported in the Journal of the Mining and Metallurgical Institute of Japan, Vol. 83, No. 952, Aug. 1967, the authors clarified already that the corner fracture was not developed essentially in a brittle rock-like material. But it has been reported that the corner fracture is produced actually in metals and in some kinds of plastics. Therefore, in this study, in order to complete the studies on the corner fracture, a plastic material (polymethyl methacrylate) was used as the test material in which the corner fracture was expected to produce, and the stress condition in it in case of blasting with two free faces was analysed by means of the method same as that used in the previous study. The results obtained in this study are as follows; (1) It was clarified both theoretically and experimentally that the corner fracture was developed in the plastic material. (2) There was the difference between the stress distribution in a rock caused by an explosion and that in a plastic material. Therefore, the pattern of the crack produced in the plastics was different from that in the rock. It suggests us that, when the plastics was used as the model material for the studies on rock blasting,. the results obtained might be analysed very carefully.

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