Sensitivity of Silicon Carbide and Other Ceramics to Edge Fracture: Method and Results

Fracture Resistance of Ceramics: Edge Fracture Method

“…By convention this test method can be termed the flaking method with a fixed loading point, it was also used by other authors for studying different ceramics [12,13]. As it was revealed [14,15], of the materials under study [10, 1 1 ], ceramics do not demonstrate an unambiguous relation between M and Gic values (Fig. 2b).…”

“…3), it can be regarded as its mechanical characteristic. It was shown [15] that the flaking toughness -critical stress intensity factor relation appeared to be close to linear for many materials. At the same time, the tests do not require special equipment completed with a microscope.…”

“…As earlier [15,16], the single-edge V-notched beam (SEVNB) method was used to determine the critical stress intensity factor K ic with the flexure of a V-notched rectangular beam. This method is suitable for testing different ceramics, it provides reliable experimental data based on a limited number of tests [2,5].…”

Crack resistance of modern ceramics and ceramic composites. II. EF method

“…This conclusion was made also by the authors in [13]. Therefore in [17] development of a new method for determining ceramic resistance to breaking was started and continued in [6], that in [18] was called the EF (edge fracture) method.…”

“…In contrast to this, the EF-method [6], according to which the indenter chips the rectangular edge of a polished specimen, combines the positive features of known test methods for crack resistance: a study of crack propagation in a specimen and breaking of a small volume of material. The present article, supplementing work in [1], is devoted to the EF method, probably similar to the method that was used to prepare weapons and tools in the Paleolithic period and not based on the ideas of linear fracture mechanics [7].…”