Abstract
Subcritical crack growth plays an important role in evaluating the long-term stability of structures in rocks. The characteristics of subcritical crack growth can be described by a relationship between the stress intensity factor and the crack velocity. This paper presents the results of studies conducted to validate the constant stress-rate test for determining subcritical crack growth parameters in rocks, compared with the conventional testing method, the double torsion test. Various types of specimens including the Brazilian disk, three-point bending, grooved disk, single edge notched bend, and compact tension specimens have been tested on Coconino sandstone under the constant stress-rate scheme and the subcritical crack growth parameters have been determined. The results of the constant stress-rate test are in good agreement with the results of double torsion test. More importantly, the stress-rate tests can determine the parameter A with a much smaller standard deviation than the DT test. Thus the constant stress-rate test seems to be a valid test method for rocks. The results show that the parameter n is almost constant regardless of the test method and specimen geometry, but the parameter A varies with the test method and specimen geometry.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 166-178 |
| Number of pages | 13 |
| Journal | International Journal of Rock Mechanics and Mining Sciences |
| Volume | 59 |
| DOIs | |
| State | Published - Apr 2013 |
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Keywords
- Brazilian test
- Coconino sandstone
- Compact tension test
- Constant stress-rate test
- Double torsion test
- Fracture toughness
- Grooved disk test
- Single edge notched bend test
- Stress intensity factor
- Subcritical crack growth
- Three point bending test
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology
Cite this
Determination of the subcritical crack growth parameters in rocks using the constant stress-rate test. / Ko, Tae Young; Kemeny, John M.
In: International Journal of Rock Mechanics and Mining Sciences, Vol. 59, 04.2013, p. 166-178.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Determination of the subcritical crack growth parameters in rocks using the constant stress-rate test
AU - Ko, Tae Young
AU - Kemeny, John M
PY - 2013/4
Y1 - 2013/4
N2 - Subcritical crack growth plays an important role in evaluating the long-term stability of structures in rocks. The characteristics of subcritical crack growth can be described by a relationship between the stress intensity factor and the crack velocity. This paper presents the results of studies conducted to validate the constant stress-rate test for determining subcritical crack growth parameters in rocks, compared with the conventional testing method, the double torsion test. Various types of specimens including the Brazilian disk, three-point bending, grooved disk, single edge notched bend, and compact tension specimens have been tested on Coconino sandstone under the constant stress-rate scheme and the subcritical crack growth parameters have been determined. The results of the constant stress-rate test are in good agreement with the results of double torsion test. More importantly, the stress-rate tests can determine the parameter A with a much smaller standard deviation than the DT test. Thus the constant stress-rate test seems to be a valid test method for rocks. The results show that the parameter n is almost constant regardless of the test method and specimen geometry, but the parameter A varies with the test method and specimen geometry.
AB - Subcritical crack growth plays an important role in evaluating the long-term stability of structures in rocks. The characteristics of subcritical crack growth can be described by a relationship between the stress intensity factor and the crack velocity. This paper presents the results of studies conducted to validate the constant stress-rate test for determining subcritical crack growth parameters in rocks, compared with the conventional testing method, the double torsion test. Various types of specimens including the Brazilian disk, three-point bending, grooved disk, single edge notched bend, and compact tension specimens have been tested on Coconino sandstone under the constant stress-rate scheme and the subcritical crack growth parameters have been determined. The results of the constant stress-rate test are in good agreement with the results of double torsion test. More importantly, the stress-rate tests can determine the parameter A with a much smaller standard deviation than the DT test. Thus the constant stress-rate test seems to be a valid test method for rocks. The results show that the parameter n is almost constant regardless of the test method and specimen geometry, but the parameter A varies with the test method and specimen geometry.
KW - Brazilian test
KW - Coconino sandstone
KW - Compact tension test
KW - Constant stress-rate test
KW - Double torsion test
KW - Fracture toughness
KW - Grooved disk test
KW - Single edge notched bend test
KW - Stress intensity factor
KW - Subcritical crack growth
KW - Three point bending test
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UR - http://www.scopus.com/inward/citedby.url?scp=84874011650&partnerID=8YFLogxK
U2 - 10.1016/j.ijrmms.2012.11.006
DO - 10.1016/j.ijrmms.2012.11.006
M3 - Article
AN - SCOPUS:84874011650
VL - 59
SP - 166
EP - 178
JO - International Journal of Rock Mechanics and Minings Sciences
JF - International Journal of Rock Mechanics and Minings Sciences
SN - 1365-1609
ER -