Fracture toughness of stripa granite cores

Sun, Zhibin; Ouchterlony, Finn

doi:10.1016/0148-9062(86)92305-3

Cited by 33 publications

(3 citation statements)

References 12 publications

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“…For example, the fracture toughness of sandstone and tuff at a/D=0.6 decreased by approximately 38% and 49%, respectively, compared with those at a/D=0.4. A similar trend has been reported by Sun and Ouchterlony for granite [10]. Consequently, a/D of less than 0.4 was used in this study since the fracture toughness was independent of notch length between a/D=0.2 and 0.4. appears that the fracture toughness measured using both the SENRBB and the SCB specimen was not affected by a limitation of the shape and the size of the specimens used.…”

Section: Effect Of Notch Lengthmentioning

confidence: 50%

Combined effects of increasing temperature and confining pressure on the fracture toughness of clay bearing rocks

Funatsu

Seto

Shimada

et al. 2004

International Journal of Rock Mechanics and Mining Sciences

197

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Section: Effect Of Notch Lengthmentioning

confidence: 50%

Combined effects of increasing temperature and confining pressure on the fracture toughness of clay bearing rocks

Funatsu

Seto

Shimada

et al. 2004

International Journal of Rock Mechanics and Mining Sciences

197

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“…Rock fracture toughness is an intrinsic rock property that is used as an index for fragmentation processes such as rock cutting, hydraulic fracturing, explosive modeling etc. [1][2][3]. Numerous experimental and numerical researches have been developed for assessing rock fracture toughness in different conditions of fracture and loading.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rock Fracture Filling on Mode I and II Fracture Toughness

نجاتی

فر

2019

anm

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This paper focuses on some fracture toughness tests performed on the pre-cracked Brazilian specimens of rock-like materials. Also the effect of rock fracture filling on the fracture toughness was considered experimentally. Fracture toughness is a key parameter for studying the crack propagation and fragmentation processes in rock structures. Fracture mechanics is an applicable tool to improve the mechanical performance of materials and components. It is a comparatively general phenomenon that rock fractures are naturally filled with gouging material, but the impact of fillings on rock fracture toughness has not yet been considered precisely. In the present study, an experimental investigation was made to evaluate the effect of rock fracture fillings on the crack propagation mechanism and fracture toughness of some rock like specimens. For this purpose, several molds are used for preparation of Brazilian disks with straight central crack. In the next stage, three different ratios of ingredients have been used for preparation of three model materials to fill the central pre-crack of the specimen. Diametrical compression load with a rate of 0.3 mm/min in different directions respect to the central crack orientation is applied to the Brazilian disk specimens and the failure loads corresponding to the each test are recorded. Result of laboratory tests indicates that fracture fillers strongly affect the value of rock fracture toughness while fracture filler has no influence on the failure mode of CSCBD specimens. Also the impact of filler cohesion on mode II fracture toughness is more than its impact on mode I fracture toughness.

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“…They did not propose a geomechanical model nor even consider validating it, because the rock properties were not available. This paper presents a bibliographic review of rock testing methods used to determine prototype design requirements as published by Sun, and Ouchterlony, (1986). Then, the theory regarding the double torsion testing is described, followed by the design and construction of the prototype and the presentation of the results obtained from 9 specimens sampled from 2 different outcrops, to estimate traceability in the testing machine.…”

Section: Introductionmentioning

confidence: 99%

Double torsion testing machine to determine the subcritical fracture index in rocks

Díaz-Guerrero

Carvajal

Palencia-Muñoz

2011

CT&F Cienc. Tecnol. Futuro

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This paper discusses the design methodology applied to build a testing machine to determine the sub-critical fracture index in a rock, based on double torsion testing in order to characterize naturally fractured formations such as those located in the Colombian Llanos Foothill Basin . These formations have been subjected to cyclic loads over time, causing fractures that trend to spread at sub-critical stress intensity values. Similarly, it presents the results of testing conducted on nine specimens of the Tambor Formation from 2 different outcrops to establish the testing traceability in the equipment.

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Fracture toughness of stripa granite cores

Cited by 33 publications

References 12 publications

Combined effects of increasing temperature and confining pressure on the fracture toughness of clay bearing rocks

Combined effects of increasing temperature and confining pressure on the fracture toughness of clay bearing rocks

Effect of Rock Fracture Filling on Mode I and II Fracture Toughness

Double torsion testing machine to determine the subcritical fracture index in rocks

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