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A convenient specimen for evaluating stress intensity factors versus crack velocities for brittle materials is presented. When the rod is stressed in uniform compression, the hole acts like a stress raiser to initiate two flat cleavage fractures which propagates in a stable way along the plane of symetry of the rod. Easy control of fracture starting or arrest is obtained by simple adjustment of the applied compressive stress. The tests have been performed on three current glasses in five media. Comparison with results given by literature shows on the whole a rather good correspondence

Specimen for fracture mechanics studies on glass