Abstract
In this investigation, fracture process zone model is used to establish a new relationship to predict the intrinsic fracture toughness from the apparent fracture toughness of a notched-crack specimen. The parameters needed in the proposed model are very rare, such as, the fracture process zone size of materials, the notch radius. Specimens made up of two kinds of polycrystalline alumina and one soda-lime glass with notch radii as small as a few micrometer are used to verify the predictions of this model. Besides, the results also show that fracture toughness of ceramics decreases with the decreasing of notch root radius. Under condition of the radius of crack tip is not greater than the averaged grain size, the apparent toughness can be approximately regarded as the fracture toughness of the materials.
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Fenghui, W. Prediction of intrinsic fracture toughness for brittle materials from the apparent toughness of notched-crack specimen. Journal of Materials Science 35, 2543–2546 (2000). https://doi.org/10.1023/A:1004746508509
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DOI: https://doi.org/10.1023/A:1004746508509