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Effects of relative humidity and temperature on subcritical crack growth in igneous rock

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Title: Effects of relative humidity and temperature on subcritical crack growth in igneous rock
Authors: Nara, Yoshitaka Browse this author
Hiroyoshi, Naoki Browse this author
Yoneda, Tetsuro Browse this author →KAKEN DB
Kaneko, Katsuhiko Browse this author
Keywords: Subcritical crack growth
Double-torsion technique
Granite
Andesite
Temperature
Relative humidity
Issue Date: Jun-2010
Publisher: Elsevier
Journal Title: International Journal of Rock Mechanics and Mining Sciences
Volume: 47
Issue: 4
Start Page: 640
End Page: 646
Publisher DOI: 10.1016/j.ijrmms.2010.04.009
Abstract: The effects of relative humidity and temperature on subcritical crack growth in igneous rock have been investigated experimentally on samples of Kumamoto andesite and Oshima granite. Stress intensity factors and crack velocities were measured using the double-torsion technique, and all experiments were conducted in moist air. Our results show that in experiments conducted under the same relative humidity, crack velocity increased with increasing temperature, in agreement with previous studies. Our results also show that, in experiments conducted at the same temperature, crack velocity increased dramatically with increasing relative humidity. A three- to four-fold increase in relative humidity resulted in an increase in crack velocity of between one and four orders of magnitude. Such an increase is larger than that predicted by classical stress corrosion theory. It is suggested that capillary condensation of water vapour close to crack tips of small aperture influences the rate of crack growth. It is concluded that relative humidity needs to be controlled to avoid time-dependent weakening and extend the life time of structures in a rock mass.
Type: article (author version)
URI: http://hdl.handle.net/2115/43106
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)

Submitter: 金子 勝比古

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