Abstract
Ceramic strength values for different flaw sizes, grain sizes and notch radii are analyzed with a grain-fracture model. The critical stress-intensity factor for small flaws is lower than that for large cracks. Therefore, conventional LEFM is not applicable for estimating ceramic component strength. However, the relationships between the ratio of equivalent crack length and mean grain diameter, a e d ,and the ratio of critical stress-intensity factors for short and long cracks, K c K Ic ,are almost identical for various kinds of ceramic materials. This fact is well expressed by the model. Moreover, both the effect of grain diameter on plain specimen strength and that of notch-root radius on the notch-toughness value are explained well with the model utilizing the K Ic value of materials.
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