Abstract
The scheme of transverse compressive loading in combination with opening up of the notch mouth in compact specimens can be effectively used for producing the initial cracks in polycrystalline refractory materials. The procedure of double-yielding makes it possible to evaluate the elastic constants of refractory materials with sufficient accuracy. This is confirmed by the satisfactory agreement between the results obtained according to different methods. In order to evaluate the crack resistance of polycrystalline refractory materials, one can employ the scheme of transverse compressive loading. However, in this case, it is necessary to use large-sized specimens. The characteristics of crack resistance decrease with decreasing dimensions of the specimens in their plan. Apparently, this is due to the increased effect of the structure of the material. Before selecting the experimental procedure, it is necessary to optimize the shape of the specimens (in particular, in the case of chevron and cantilever specimens having lateral notches) for obtaining more reliable results. In order to avoid misinterpretation of the obtained results, and to carry out a comparative study of the results, a complex approach is most advisable when evaluating the crack resistance of refractory materials.
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