In this paper, the effect of specimen size on compression splitting tests is investigated experimentally by the caustics method. Specifically, we investigated the stress intensity factor and compression load ratio KI/P by varying the specimen width d from 10 to 60 mm, height h from 20 to 100 mm, notch length a from 4 to 36 mm, thickness t from 3 to 10 mm, and platen width w from 3 to 12 mm, respectively. The experimental KI /P values are shown to approximately coincide with values calculated using the compression splitting method for a notch lengths of 15 and 20 mm, a thickness ranging from 6 mm to 10 mm, a width of 15 mm, a height ranging from 20 mm to 100 mm, and a platen width ranging from 6 mm to 12 mm, within the accuracy of experimental conditions of the present study.
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