한국지구물리탐사학회:학술대회논문집
- 2003.11a
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- Pages.221-228
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- 2003
Stress corrosion index of Kumamoto andesite estimated from two types of testing method
- Jeong Hae-Sik (Seoul National University) ;
- Nara Yoshitaka (Hokkaido University) ;
- Obara Yuzo (Kumamoto University) ;
- Kaneko Katsuhiko (Hokkaido University)
- Published : 2003.11.01
Abstract
The stress corrosion index of Kumamoto andesite are evaluated by two types of testing method. One is the uniaxial compression test under various water vapor pressures, and the other is the double torsion (DT) test under a constant water vapor pressure. For the uniaxial compression tests, the uniaxial compressive strength increases linearly with decreasing water vapor pressure on the double logarithmic coordinates. As the results, the stress corrosion index obtained is estimated 44. On the other hand, in the DT test, the relaxation (RLX) test and the constant displacement rate (CDR) test were conducted. For the CDR test, as the displacement rate of loading point increases, the crack velocity increases. However, the fracture toughness is constant regardless of the change in displacement rate and the average fracture toughness is evaluated
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