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

Fowell, R.J.; Xu, Chaoshui; Dowd, P. A.

doi:10.1007/s00024-006-0057-7

Cited by 48 publications

(20 citation statements)

References 17 publications

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“…Preliminary results from an approximate analytic solution for the problem of a disc with a relatively long central elliptic crack indicate that the results for the SIFs are significantly differentiated. This observation in conjunction with the respective one concerning the rotation of the crack axis during loading [18] support further the view that the standardized formulae for KIC needs to be updated, as it has been already indicated by a number of researchers [7][8][9][10][11].…”

Section: Discussionsupporting

confidence: 81%

“…Moreover some researchers believe that "… the formula of ISRM was inadequate and inaccurate" [10] while even Fowell, who is among the founders of the respective ISRM standard stated, that "… it may be necessary to revise the dimensionless SIF values for a future release of the suggested method to incorporate some recent developments. More research and input from different sources need to be coordinated [11]".…”

Section: Introductionmentioning

confidence: 99%

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Critical Aspects of the Cracked Brazilian-disc test Explored by the Method of Caustics

Kourkoulis¹

2014

AMS

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He is the author of about eighty publications in peer-reviewed scientific journals and of about ninety publications in proceedings of international conferences with full-text review. He authored two text books on Strength of Materials (in Greek) and edited four volumes with conference proceedings. He is Scientific Responsible in twenty one research projects of total budget exceeding 2.5 million Euros. He has taught more than sixty semester-courses on Mechanics, Strength of Materials and Biomechanics. His main research interests are focused to the failure of materials, the mechanical behaviour of rock-like materials (with emphasis to materials used for the restoration and conservation of Cultural Heritage monuments) and the Biomechanics of the Musculoscetal System.

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Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Critical Aspects of the Cracked Brazilian-disc test Explored by the Method of Caustics

Kourkoulis¹

2014

AMS

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“…Shetty et al (1985) used 1/ √ R in the initial development of the CCNBD method formulation. The use of 1/ √ R term was proposed in Fowell and Xu (1993); Xu and Fowell (1994); Fowell and Xu (1994); Fowell et al (2006); Iqbal and Mohanty (2006); Nasseri and Mohanty (2008) and Cui et al (2010). Using 1/ √ R term in the basic formula and constants u and ν improved by Wang et al (2004b) and Wang (2010) for computation of the dimensionless stress intensity factor, average K Ic becomes 1.62 ± 0.07 MPa √ m for CCNBD tests on andesite rock.…”

Section: Maximum Stress Intensity Factor Computationsmentioning

confidence: 98%

Investigation of proper specimen geometry for mode I fracture toughness testing with flattened Brazilian disc method

Keleş

Tutluoğlu

2011

Int J Fract

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Investigation of geometrical parameters for flattened Brazilian disc method is important, since this is a simple and attractive method for mode I fracture toughness testing on rock cores. Evaluating numerical modeling results, a parametric equation in terms of principal stresses at the center of the disc and the loading angle of the flattened end was developed. An equation was proposed for maximum stress intensity factors at critical crack lengths around stable to unstable crack propagation. Comparing fracture toughness results of flattened Brazilian disc method to the results of the suggested cracked chevron notched Brazilian disc method, geometrical parameters for flattened Brazilian discs were investigated. Diameter, loading angle of flattened ends, and thickness of andesite rock core specimens were changed to obtain comparable results to the suggested method. The closest results to the suggested method were obtained by 54 mm diameter discs with loading angles larger than 32 • , and thicknesses between 19 and 34 mm. Results were confirmed by the flattened Brazilian disc tests on a marble rock. In flattened Brazilian disc tests with smaller loading angles and larger diameters, larger fracture toughness values than the results of the suggested cracked chevron notched were obtained. However, excluding tests with large loading angles over 27 • ; specimen size was less effective on the results of these tests. Critical crack C. Keles (B) · L. Tutluoglu length parameters computed from modeling and experiments were close to each other for the flattened Brazilian disc specimens with smaller loading angles around 20 • and thickness/radius ratio equal or less than 1.1.

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“…The method used to evaluateK IC is best defined as follows (Nasseri et al, 2007;Fowell, 1995Fowell, , 2006: …”

Section: Experimental Set-up and Samplesmentioning

confidence: 99%

“…2) specimens (Fowell, 1995(Fowell, , 2006. This type of specimen has a small volume, can be easily processed using a rock core, and can withstand heavy loading.…”

Section: Experimental Set-up and Samplesmentioning

confidence: 99%

Study of fracture toughness and weakening mechanisms in gypsum interlayers in corrosive environments

Meng

Fang

et al. 2015

Journal of Natural Gas Science and Engineering

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

Cited by 48 publications

References 17 publications

Critical Aspects of the Cracked Brazilian-disc test Explored by the Method of Caustics

Critical Aspects of the Cracked Brazilian-disc test Explored by the Method of Caustics

Investigation of proper specimen geometry for mode I fracture toughness testing with flattened Brazilian disc method

Study of fracture toughness and weakening mechanisms in gypsum interlayers in corrosive environments

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