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Subcritical crack growth under mode ...

The University of Arizona., Mining Geological & Geophysical Engineering.

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Subcritical crack growth under mode I, II, and III loading for Coconino sandstone.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Subcritical crack growth under mode I, II, and III loading for Coconino sandstone./
作者:	Ko, Tae Young.
面頁冊數:	301 p.
附註:	Adviser: John Kemeny.
Contained By:	Dissertation Abstracts International69-12B.
標題:	Engineering, Mining. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3339306
ISBN:	9780549953944

Subcritical crack growth under mode I, II, and III loading for Coconino sandstone.
Ko, Tae Young.

Subcritical crack growth under mode I, II, and III loading for Coconino sandstone. - 301 p.

Adviser: John Kemeny.

Thesis (Ph.D.)--The University of Arizona, 2008.

In systems subjected to long-term loading, subcritical crack growth is the principal mechanism causing the time-dependent deformation and failure of rocks. Subcritical crack growth is environmentally-assisted crack growth, which can allow cracks to grow over a long period of time at stresses far smaller than their failure strength and at tectonic strain rates. The characteristics of subcritical crack growth can be described by a relationship between the stress intensity factor and the crack velocity.

ISBN: 9780549953944Subjects--Topical Terms:

1035560
Engineering, Mining.

Subcritical crack growth under mode I, II, and III loading for Coconino sandstone.
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020 $a 9780549953944
035 $a (UMI)AAI3339306
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100 1 $a Ko, Tae Young. $3 1035677
245 1 0 $a Subcritical crack growth under mode I, II, and III loading for Coconino sandstone.
300 $a 301 p.
500 $a Adviser: John Kemeny.
500 $a Source: Dissertation Abstracts International, Volume: 69-12, Section: B, page: 7783.
502 $a Thesis (Ph.D.)--The University of Arizona, 2008.
520 $a In systems subjected to long-term loading, subcritical crack growth is the principal mechanism causing the time-dependent deformation and failure of rocks. Subcritical crack growth is environmentally-assisted crack growth, which can allow cracks to grow over a long period of time at stresses far smaller than their failure strength and at tectonic strain rates. The characteristics of subcritical crack growth can be described by a relationship between the stress intensity factor and the crack velocity.
520 $a This study presents the results of studies conducted to validate the constant stress-rate test for determining subcritical crack growth parameters in Coconino sandstone, compared with the conventional testing method, the double torsion test. 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 double torsion test. Thus the constant stress-rate test seems to be both a valid and preferred test method for determining the subcritical crack growth parameters in rocks.
520 $a We investigated statistical aspects of the constant stress-rate test. The effects of the number of tests conducted on the subcritical crack growth parameters were examined and minimum specimen numbers were determined. The mean and standard deviation of the subcritical crack growth parameters were obtained by randomly selecting subsets from the original strength data. In addition, the distribution form of the subcritical crack growth parameters and the relation between the parameter n and A were determined.
520 $a We extended the constant stress-rate test technique to modes II and III subcritical crack growth in rocks. The experimental results of the modes I, II and III tests show that the values of the subcritical crack growth parameters are similar to each other. The subcritical crack growth parameter n value for Coconino sandstone has the range of 34 to 38 and the parameter A has the range of 1.02x10-2 to 6.52x10-2 m/s. The effect of confining stress, specimen size, and water saturation on subcritical crack growth under mode II loading has also been investigated.
520 $a Finally strength parameters for Coconino sandstone were determined experimentally, including tensile strength, uniaxial compressive strength, cohesion, internal friction angle, in-plane/our-of-plane shear strength and the fracture toughness under mode I, II, and III loading.
590 $a School code: 0009.
650 4 $a Engineering, Mining. $3 1035560
650 4 $a Geophysics. $3 535228
650 4 $a Geotechnology. $3 1018558
690 $a 0373
690 $a 0428
690 $a 0551
710 2 $a The University of Arizona. $b Mining Geological & Geophysical Engineering. $3 1035676
773 0 $t Dissertation Abstracts International $g 69-12B.
790 $a 0009
790 1 0 $a Budhu, Muniram $e committee member
790 1 0 $a Kemeny, John, $e advisor
790 1 0 $a Kim, Chee Hwan $e committee member
790 1 0 $a Kundu, Tribikram $e committee member
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3339306