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Crack Front Geometry and Stress Intensity Factor of Semi‑circular Bend Specimens with Straight Through and Chevron Notches
http://hdl.handle.net/2298/00031534
http://hdl.handle.net/2298/00031534f53121a5-7ef9-4c89-b4ca-a509e83c22a5
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
Rock _1-16_20190820.pdf (2.8 MB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2020-09-04 | |||||
| タイトル | ||||||
| タイトル | Crack Front Geometry and Stress Intensity Factor of Semi‑circular Bend Specimens with Straight Through and Chevron Notches | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 主題 | SCB test, Chevron notch, Geometry of crack front, Stress intensity factor, FEM, Fracture toughness | |||||
| 資源タイプ | ||||||
| 資源タイプ | journal article | |||||
| 著者 |
尾原, 祐三
× 尾原, 祐三× Nakamura, Kimiharu× Yoshioka, Singo× Sainoki, Atsushi× Kasai, Akira |
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| 別言語の著者 |
尾原, 祐三
× 尾原, 祐三× 才ノ木, 敦士× 葛西, 昭 |
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| 内容記述 | ||||||
| 内容記述 | The semi-circular bending (SCB) test is one of the most useful testing methods for determining the mode-I fracture toughness of rocks. An SCB specimen with an artificial notch is loaded at three points including two lower points and a single upper point during the test. In general, there are two types of geometries for artificial notches: straight through and chevron notches. The straight through notch is commonly adopted for the SCB (STNSCB) test as the suggested method for estimating mode-I fracture toughness of rocks in ISRM, while the cracked chevron notch SCB (CCNSCB) test using a specimen with a chevron notch has been performed by some researches. In this paper, by means of the commercial finite-element software ABAQUS, cracking behavior from the tip of an artificial notch during STNSCB and CCNSCB tests is analyzed with Extended Finite-Element Method (XFEM) to clarify crack front geometry in the process of cracking. The relationship between the crack length and the stress intensity factor can be obtained by analyzing stress intensity factors of the specimen with FEM, based on crack front geometries calculated with XFEM during the cracking process. Using this relationship, the minimum stress intensity factor at a critical crack length is determined for estimating mode-I fracture toughness of the rock for the CCNSCB test. Furthermore, by performing the SCB tests using Kimachi sandstone specimens with three different artificial notch geometries, fracture toughness of the sandstone is determined from the SCB test. Consequently, it is concluded that the values of fracture toughness from the test with three notch geometries are almost the same. | |||||
| 書誌情報 |
Rock Mechanics and Rock Engineering p. 723-738, 発行年 2019-08-19 |
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| ISSN | ||||||
| 収録物識別子 | 07232632 | |||||
| DOI | ||||||
| 関連タイプ | isVersionOf | |||||
| 関連識別子 | 10.1007/s00603-019-01930-5 | |||||
| 権利 | ||||||
| 権利情報 | © Springer-Verlag GmbH Austria, part of Springer Nature 2019 | |||||
| 著者版フラグ | ||||||
| 出版タイプ | AM | |||||
| 日本十進分類法 | ||||||
| 主題Scheme | NDC | |||||
| 主題 | 560 | |||||
| 出版者 | ||||||
| 出版者 | Springer | |||||
| URL | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | https://link.springer.com/article/10.1007/s00603-019-01930-5 | |||||
