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Fracture toughness of glasses as measured by the SCF and SEPB methods |
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| Affiliation: | 1. Institute of Non-Metallic Materials, Clausthal University of Technology, 38678 Clausthal-Zellerfeld, Germany;2. Federal Institute of Materials Research and Testing (BAM), 12489, Berlin, Germany;3. Otto-Schott-Institute of Materials Research, Friedrich Schiller University of Jena, 07743 Jena, Germany;1. Otto Schott Institute of Materials Research, University of Jena, Fraunhoferstrasse 6, D-07743 Jena, Germany;2. Asahi Glass Co., Ltd., 1150 Hazawa-cho, Kanagawa-ku, Yokohama-shi, Kanagawa 221-8755, Japan |
| Abstract: | The fracture toughness, KIc, of six glasses was measured by the surface crack in flexure (SCF) and single-edged precracked beam (SEPB) methods. Results depended upon the loading rate as well as the test environment. Environmentally-assisted slow crack growth affects the results for tests done in air. Dry nitrogen testing is preferred. Crack healing may be a severe complicating factor with precracked flexure bar type specimens if the specimens are unloaded between the precracking and final fracture test. Success in KIc testing depends to a large degree on upon the ability to make good precracks. |
| Keywords: | Borosilicate Crack healing Fracture toughness Fractography Fused silica Glass Surface crack in flexure Single-Edge precracked beam |
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