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Effects of humidity and temperature on subcritical crack growth in sandstone
| Title: | Effects of humidity and temperature on subcritical crack growth in sandstone |
| Authors: | Nara, Yoshitaka Browse this author | | Morimoto, Kazuya Browse this author | | Yoneda, Tetsuro Browse this author →KAKEN DB | | Hiroyoshi, Naoki Browse this author | | Kaneko, Katsuhiko Browse this author |
| Keywords: | Subcritical crack growth | | Sandstone | | Double Torsion method | | Temperature | | Relative humidity | | Clay |
| Issue Date: | Apr-2011 |
| Publisher: | Elsevier |
| Journal Title: | International Journal of Solids and Structures |
| Volume: | 48 |
| Issue: | 7-8 |
| Start Page: | 1130 |
| End Page: | 1140 |
| Publisher DOI: | 10.1016/j.ijsolstr.2010.12.019 |
| Abstract: | In order to ensure long-term stability of structures in a rock mass, the study of time-dependent fracturing is essential. The influences of the surrounding environmental conditions and rock fabric on subcritical crack growth in sedimentary rocks in air are yet to be clarified, while the nature of subcritical crack growth in igneous rocks has been studied well. In this study, the influences of temperature and relative humidity on subcritical crack growth in Berea sandstone, Shirahama sandstone and Kushiro sandstone were investigated in air. The load relaxation method of Double Torsion (DT) testing method was used to measure both crack velocity and stress intensity factor under a controlled temperature and relative humidity. Results show that the change of the crack velocity at a given stress intensity factor was unclear when the temperature increased under a constant relative humidity in air. On the other hand, we show that the crack velocity increased by several orders of magnitude when the relative humidity increased threefold or fourfold under a constant temperature at a given stress intensity factor. This increase is much larger than that expected from the conventional concept based on the theory of stress corrosion. It is therefore necessary to consider the additional mechanisms for subcritical crack growth in sandstone. The increase of the crack velocity was larger for sandstone which contained larger amount of clays. We conclude that subcritical crack growth in sandstone in air is affected remarkably by the relative humidity and the amount of clays in rock. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/45104 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 金子 勝比古
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