Theoretical treatment of tangential loading effects on the Brazilian test stress distribution

Lavrov, Alexandre; Vervoort, André

doi:10.1016/s1365-1609(02)00010-2

Cited by 54 publications

(25 citation statements)

References 7 publications

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“…As also theoretically shown in [29], the stress distribution inside the samples under Brazilian loading is only marginally affected by the effect of the frictional conditions at the boundary. In fact, Fig.…”

Section: Validation Against the Theoretical Solution At Low Stress Levelsupporting

confidence: 67%

Microcrack modelling of Brazilian tensile tests with the boundary element method

Lanaro¹,

Sato²,

Stephansson

2009

International Journal of Rock Mechanics and Mining Sciences

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Section: Validation Against the Theoretical Solution At Low Stress Levelsupporting

confidence: 67%

Microcrack modelling of Brazilian tensile tests with the boundary element method

Lanaro¹,

Sato²,

Stephansson

2009

International Journal of Rock Mechanics and Mining Sciences

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“…18 The effect of element size on stress distribution in a model specimen with a geometrical ratio 0.2 and relative width of bearing strip of 0.2 Tensile strength using fracture mechanics concepts 279 would be reasonable to neglect the tangential forces in the main part of the specimen diameter in the Brazilian test. This is consistent with the findings presented by Lavrov and Vervoort (2002).…”

Section: Width Of Bearing Stripssupporting

confidence: 94%

Experimental and numerical analysis of indirect and direct tensile strength using fracture mechanics concepts

Fahimifar

Malekpour

2011

Bull Eng Geol Environ

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Brazilian tests were conducted on an isotropic limestone with different length-to-diameter ratios and various bearing strip widths. The direct tensile strength of the rock specimens was also obtained using direct tension test apparatus and a servo-control testing machine. The Brazilian test was modeled using the computer program (Abaqus 6.7-1) and both smeared rotating crack and cohesive crack models were selected for the analysis of crack propagation. Comparison of the experimental and numerical analyses showed that the results from the smeared rotating crack model were closer to the experimental results than those from the cohesive crack model. Appropriate testing conditions for the Brazilian test are proposed, in order to achieve the results closest to the direct tension test.Keywords Brazilian test Á Width of bearing strip Á Geometrical ratio Á Direct tension test Á Fracture mechanics Á Rock Résumé Des essais brésiliens ont été réalisés sur des calcaires isotropes avec différents ratios longueur/diamètre et différentes largeurs de bandes d'application de la charge. La résistance à la traction directe des échantillons a été aussi obtenue grâce à des essais de traction directe réalisés avec une machine d'essais asservie. L'essai brésilien a été modélisé avec le logiciel Abaqus 6.7-1, utilisant un modèle à fissuration distribuée et un modèle à fissures cohésives. La comparaison entre les résultats expérimentaux et les analyses numériques a montré que le modèle à fissuration distribuée rendait mieux compte des résultats expériment-aux que le modèle à fissures cohésives. Des conditions d'essai appropriées ont été proposées pour l'essai brésilien afin rapprocher les résultats de cet essai de ceux de l'essai de traction directe.

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“…Recently, theoretical and numerical results indicate that friction between the platen and the specimen can affect the stress distribution in the immediate vicinity of the contact rim. But the stress field at the disc's centre is totally insensitive to the exact distribution of radial pressure and also to the presence or absence of friction (Lavrov and Vervoort 2002;Lanaro et al 2009;Markides et al 2010Markides et al , 2011Markides and Kourkoulis 2013). Thus, the specimens were placed directly between the loading platens and friction was ignored.…”

Section: Test Apparatus and Schemementioning

confidence: 99%

Dynamic Brazilian Tests of Granite Under Coupled Static and Dynamic Loads

et al. 2013

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Rocks in underground projects at great depth, which are under high static stresses, may be subjected to dynamic disturbance at the same time. In our previous work (Li et al. Int J Rock Mech Min Sci 45(5):739-748, 2008), the dynamic compressive behaviour of pre-stressed rocks was investigated using coupled-load equipment. The current work is devoted to the investigation of the dynamic tensile behaviour of granite rocks under coupled loads using the Brazilian disc (BD) method with the aid of a high-speed camera. Through wave analyses, stress measurements and crack photography, the fundamental problems of BD tests, such as stress equilibrium and crack initiation, were investigated by the consideration of different loading stresses with abruptly or slowly rising stress waves. The specially shaped striker method was used for the coupled-load test; this generates a slowly rising stress wave, which allows gradual stress accumulation in the specimen, whilst maintaining the load at both ends of the specimen in an equilibrium state. The test results showed that the tensile strength of the granite under coupled loads decreases with increases in the static pre-stresses, which might lead to modifications of the blasting design or support design in deep underground projects. Furthermore, the failure patterns of specimens under coupled loads have been investigated. Travelling time of the stress wave (s) r t Dynamic tensile strength of the specimen (MPa) r c Dynamic compressive strength of the specimen (MPa) r 0 Amplitude of the assumed stress pulse (MPa) P Static force applied on the specimen (N) P c Equivalent force applied on the specimen under coupled loads (N)

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Theoretical treatment of tangential loading effects on the Brazilian test stress distribution

Cited by 54 publications

References 7 publications

Microcrack modelling of Brazilian tensile tests with the boundary element method

Microcrack modelling of Brazilian tensile tests with the boundary element method

Experimental and numerical analysis of indirect and direct tensile strength using fracture mechanics concepts

Dynamic Brazilian Tests of Granite Under Coupled Static and Dynamic Loads

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