Abstract
Fracture toughness was measured different ceramics by the Single Edge V-Notched Beam (SEVNB) method in a joint VAMAS/ESIS round robin with over 30 participants. The method measures the fracture toughness for a notch smaller than 30 µm. Very consistent results have been obtained for an alumina-998 with K1c 3.57 ± 0.22 MPa im and a silicon nitride with KIc 5.35 ± 0.33 MPa 4m. In the round robin the within-lab repeatability coefficient of variation for the alumina-998 was 4.6% and the between-lab reproducibility coefficient of variation 6.1%. For the silicon nitride the results were 5.3% and 6.3%, respectively. Contrary to the alumina-998, the fracture toughness measured for the silicon nitride with the SEVNB method compared well with values from the SEPB, CN and SCF methods. In general, the polishing procedure worked well for both materials and most participants were able to polish V-notches with a width smaller than 30 um. The SEVNB method proved to be user-friendly and easy to conduct and therefore might be a potential standard test method.
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Kübler, J. (2002). Fracture Toughness of Ceramics Using the SEVNB Method a Joint VAMSA/ESIS Round Robin. In: Bradt, R.C., Munz, D., Sakai, M., Shevchenko, V.Y., White, K. (eds) Fracture Mechanics of Ceramics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-4019-6_33
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DOI: https://doi.org/10.1007/978-1-4757-4019-6_33
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