Notch radius effect on fracture toughness of ceramics pertinent to grain size

Quantitative Strength Prediction of Advanced Ceramics With Regular/Irregular Flaws in I-Mode Condition

“…[20]), and the β values of ZrB2-SiC, ZrB2, 5Y-TZP and SiC are obtained as 1.08, 0.962, 0.719 and 0.903 (see Fig. 4), respectively, which are consistent with the range from 0.7 to 1.3 reported by Yang et al [19].…”

“…In actual situations, results sometimes show that the Sato-Gómez model fits better than the Sato-Yang model due to the dispersion of strength, but based on more test data, it is reasonable to believe that the the latter one is generally more accurate in strength prediction. However, the shortcoming of the Sato-Yang model is that the acquisition of β values (between 0.7 and 1.3 [19]) is troublesome, which requires researchers to provide more comprehensive material data.…”

“…Supposing that both crack and other typical flaws are damaged and cause fracture when maximum stress reaches the critical value (material constant), the crack problem can be transformed into a common flaw problem by introducing Kc-r coefficient. Here, drawing on the Kc-r relationships proposed by Gómez [18] and Yang [19], the following two regular flaw-strength models are obtained respectively: Sato-Gómez model:…”

“…Realization of ceramic strength from qualitative statistical description to quantitative prediction is essential for the fields of fracture mechanics, materials science and engineering applications. In this study, two regular flaw-strength prediction models with clear physical meaning were established under I-mode failure according to the classic crack-strength model (Sato [17]) combined with two critical stress intensity factor Kc vs. tip radius r relationships (Gómez [18] and Yang [19]). Comparison with the data that reported in the literature proved that the Sato-Yang model was more accurate than the Sato-Gómez model.…”

Microstructural evolution and mechanical properties of nano-ATZ ceramics by solid solution precipitation

“…In The SEM image of SEVNB sample showing that a femtosecond laser is used to cut an ultra-sharp Vnotch based on the U-notch. (c) An enlarged view of the V-notch with the tip radius of ~0.6 μm (much less than three times the grain size of ceramics [27][28][29]) indicating that this method can accurately measure the fracture toughness of ceramics.…”