A method to estimate the influence of the notch-root radius on the fracture toughness measurement of ceramics |
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| Affiliation: | 1. IFP, Dept. de Mécanique Appliquée, Rueil-Malmaison, France;2. Laboratoire de Modelisation en Mecanique, CNRS UMR7607, Université P. et M. Curie, Tour 66 - Case 162, 4 Place Jussieu, 75252 Paris Cedex 05, France;1. Department Materials Physics, Montanuniversität Leoben, Austria;2. Material Center Leoben Forschungs GmbH, Leoben, Austria;3. Erich Schmid Institute, Austrian Academy of Sciences, Leoben, Austria;1. Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology (NTNU), Richard Birkelands vei 2B, 7491, Norway;2. SINTEF Materials & Chemistry, Department of Materials Integrity and Welding, Richard Birkelands vei 2B, 7491, Norway |
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| Abstract: | The fracture toughness measurement of ceramics is based on notched specimens. If the notch-root radius is too large, it leads to overestimate the actual fracture toughness of the material. It is then necessary to control the notch shape and to machine it carefully in order to have a root-radius small enough (<10 μm) to be below the sensitivity threshold of the material. Then, the notch confounds with a sharp crack. Alternatively, it is proposed in this work to bring a correction to the measured fracture toughness depending on the notch-root radius. No restriction is brought to this radius except that it must be small compared to the notch length. |
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