Comparison of fracture resistance as measured by the indentation fracture method and fracture toughness determined by the single-edge-precracked beam technique using silicon nitrides with different microstructures |
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| Affiliation: | 1. CEITEC – Central European Institute of Technology, Brno University of Technology, Technicka 10, Brno 616 00, Czech Republic;2. Institute of Materials Science and Engineering, Brno University of Technology, Technicka 2, Brno 616 00, Czech Republic;3. CEITEC IPM, Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Zizkova 513/22, Brno 616 62, Czech Republic;1. State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200072, China;2. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;1. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Graduate School of the Chinese Academy of Science, Beijing 100039, China;3. No. 2 High school of East China Normal University, Shanghai 201203, China;1. Department of Applied Chemistry and Biotechnology, Niihama National College of Technology, 7-1 Yagumo-cho, Niihama-shi 792-8580, Japan;2. Honda Research and Development Co., Ltd., Wako-shi 351-0193, Japan;3. Department of Materials Science and Technology, Nagaoka University of Technology, Nagaoka-shi, 940-2188, Japan;4. Material and Biological Chemistry, Graduate School of Science and Engineering, Yamagata University, Yamagata-shi 990-8560, Japan;1. School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China;2. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China;1. Department of Metallurgy and Materials Engineering (MTM), KU Leuven, Kasteelpark Arenberg 44-bus 2450, B-3001 Heverlee, Belgium;2. Laboratoire National des Champs Magnétiques Intenses (LNCMI), Rue des Martyrs 25, B.P. 166, 38042 Grenoble, France |
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| Abstract: | Because of the industrial need for an assessment of fracture resistance, KR from small ceramic parts, KR of Si3N4 ceramics has been measured by the indentation fracture (IF) method using representative formulae to evaluate the compatibility with the fracture toughness, KIc determined from the single-edge-precracked beam (SEPB) technique. KR of the fine Si3N4 showed little dependence on the crack length, whereas the samples with coarse microstructures exhibited a rising R-curve behavior. The IF equation which gave the nearest value to KIc from SEPB was different depending on the microstructures. The assessment of fracture resistance with Miyoshi's equation was considered to be preferable for the flat R-curve behavior. By contrast, in the case of the rising R-curve behavior, it was revealed that the relationship between the IF and SEPB values was difficult to explain unless the effective crack extension against KIc for SEPB was clarified. |
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