ABSTRACT

For orthotropic materials, the value of tensile stress generating near the loading plate is influenced by contact area between loading plates and specimen in the diametrical compression test. However, very few studies on determination of contact area in diametrical compression test have been carried out. In this paper, the method of determination for contact area between loading plates and specimen in diametrical compression test is shown. For this method, the relation between the contact area and the ratio of tensile strain generating near the loading plate to that generating in the center of the specimen is calculated using theoretical solution and these results are shown in graphical representation. Furthtermore, this method is confirmed just befor failure for specimen that is made of mortar during experiments.

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