Fracture toughness of rocks under sub-zero temperature conditions

Dwivedi, Ravi; Soni, Aakash; Goel, Rajeev K.; Dube, Āśīsha

doi:10.1016/s1365-1609(00)00051-4

Cited by 101 publications

(38 citation statements)

References 11 publications

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“…The International Society for Rock Mechanics (ISRM) has recommended three methods, namely, Chevron Bend (CB), Short Rod (SR) and CCNBD methods, [22,23] for determining the fracture toughness of rock using core based specimens. However, comparison tests among the three methods have consistently yielded 30-50% lower values with the CCNBD method than the other two [24]. This anomaly has been recently resolved and suitable corrective procedures drawn up to yield fracture toughness values with CCNBD that are consistent with the other two methods [25,26], provided special care is taken in selection of specimen sizes and handling of anisotropy issues.…”

Section: Fracture Toughnessmentioning

confidence: 99%

Fracture toughness anisotropy in granitic rocks

Nasseri

Mohanty

2008

International Journal of Rock Mechanics and Mining Sciences

183

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Section: Fracture Toughnessmentioning

confidence: 99%

Fracture toughness anisotropy in granitic rocks

Nasseri

Mohanty

2008

International Journal of Rock Mechanics and Mining Sciences

183

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“…The International Society for Rock Mechanics (ISRM) has recommended three methods, namely, Chevron Bend (CB), Short Rod (SR) and Chevron Cracked Notch Brazilian Disc (CCNBD) methods, (ISRM, 1988(ISRM, , 1995 for determining the fracture toughness of rock using core-based specimens. However, comparison tests among the three methods have consistently yielded 30 to 50% lower values with the CCNBD method than the other two (DWIVEDI et al, 2000). This anomaly has been recently resolved, and suitable corrective procedures drawn up to yield fracture toughness values with CCNBD that are consistent with the other two methods (IQBAL and MOHANTY, 2005), provided special care is taken in the selection of specimen sizes and handling of anisotropy issues.…”

Section: Fracture Toughnessmentioning

confidence: 99%

Fracture Toughness Measurements and Acoustic Emission Activity in Brittle Rocks

Nasseri

Mohanty

Young

2006

Pure appl. geophys.

106

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Fracture toughness measurements under static loading conditions have been carried out in Barre and Lac du Bonnet granites. An advanced AE technique has been adopted to monitor real-time crack initiation and propagation around the principal crack in these tests to understand the processes of brittle failure under tension and related characteristics of the resulting fracture process zone. The anisotropy of Mode I fracture toughness has been investigated along specific directions. Microcrack density and orientation analysis from thin section studies have shown these characteristics to be the primary cause of the observed variation in fracture toughness, which is seen to vary between 1.14 MPa.(m) 1/2 and 1.89 MPa.(m) 1/2 in Barre granite. The latter value represents the case in which the crack is propagated at right angles to the main set of microcracks. The creation of a significant fracture process zone surrounding the propagating main crack has been confirmed. Real-time imaging of the fracture process and formation of fracture process zone by AE techniques yielded results in very good agreement with those obtained by direct optical analysis.

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“…Compared with the Chevron bend (CB) and short rod (SR) specimens, the CCNBD has numerous advantages which include easier sample preparation, much higher failure load, simpler testing procedure and it is easily adaptable for mixed-mode fracture toughness testing. Some selected publications about the use of the specimen include CHANG et al (2002), DWIVEDI et al (2000), AL-SHAYEA et al (2000) and KRISHNAN et al (1998).…”

Section: Introductionmentioning

confidence: 99%

An Update on the Fracture Toughness Testing Methods Related to the Cracked Chevron-notched Brazilian Disk (CCNBD) Specimen

Fowell

Dowd

2006

Pure appl. geophys.

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This paper reviews the use of the cracked Chevron-notched Brazilian disc (CCNBD) for fracture toughness testing. Theoretical and experimental backgrounds of the method are described. Some issues regarding the current development (i.e., recalibration) of the specimen geometry are presented and discussed. A number of geometries related to the CCNBD proposed recently for fracture toughness testing of rock are then introduced and commented on.

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Fracture toughness of rocks under sub-zero temperature conditions

Cited by 101 publications

References 11 publications

Fracture toughness anisotropy in granitic rocks

Fracture toughness anisotropy in granitic rocks

Fracture Toughness Measurements and Acoustic Emission Activity in Brittle Rocks

An Update on the Fracture Toughness Testing Methods Related to the Cracked Chevron-notched Brazilian Disk (CCNBD) Specimen

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