A reinvestigation of the validity of the indentation fracture (IF) method as applied to ceramics |
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| Affiliation: | 1. CEITEC – Central European Institute of Technology, Brno University of Technology, 616 00 Brno, Czech Republic;2. Institute of Materials Science and Engineering, Brno University of Technology, 616 69 Brno, Czech Republic;1. Laboratory for Biomaterials, Materials Research Centre, Indian Institute of Science, Bangalore 560012, India;2. Laboratory for Biomaterials, Department of Materials Science and Engineering, Indian Institute of Technology, Kanpur 208016, India;1. CEITEC - Central European Institute of Technology, Brno University of Technology, 616 00 Brno, Czech Republic;2. Institute of Materials Science and Engineering, Brno University of Technology, 616 69 Brno, Czech Republic;1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. Cixing New Materials Co. Ltd., Qingdao, China |
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| Abstract: | Poor correlation between indentation fracture resistance, KIFR, and fracture toughness, KIC, has long been considered a weak point of the indentation fracture (IF) method of materials analysis. The present work therefore assessed the reliability of the experimental data that has historically been used for comparisons of KIFR and KIC. A painstaking survey of primary literature reports concerning the IF method revealed that the comparisons of KIC with KIFR in most studies were imperfect because both KIC and KIFR were measured using unreliable techniques and because improper test materials such as silicate glass were employed. These findings indicate that the standard objections against the use of the IF model are not well supported, and also that the majority of the empirically-derived calibration constants used in various IF equations are suspect. Accordingly, it is evident that new experimental measurements using the latest and most reliable techniques will be required to allow well-informed discussions of the validity of this test method in future. |
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| Keywords: | Indentation Toughness Indentation fracture resistance |
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