The Brazilian Disc Test Under a Non-Uniform Contact Pressure Along Its Thickness

Serati, Mehdi; Alehossein, Habib; Erarslan, N.

doi:10.1007/s00603-015-0773-3

Cited by 11 publications

(4 citation statements)

References 9 publications

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“…The influence of the contact friction and the radii ratios between disc and jaw in the stress field of the disc has also been analysed (Markides and Kourkoulis 2016). Other research works include analytical methods by revising the initial models with correction factors (Huang et al 2014;Lin et al 2016) or by applying elasticity principles in the contact area or along the disc length (Claesson and Bohloli 2002;Markides et al 2011;Markides and Kourkoulis 2012;Serati et al 2014Serati et al , 2016.…”

Section: Introductionmentioning

confidence: 99%

Computational Verification of the Optimum Boundary Condition of the Brazilian Tensile Test

et al. 2018

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The present research analyses the configuration of jaws to avoid the premature failure of the disc in the Brazilian test. The objective is to depict the loading device configuration that most likely produces results comparable to the Hondros' analytical stress solution. To this end, several numerical analyses have been carried out for different contact angles with the Finite Element Method. It was deduced that the final contact angle plays an important part in the success of the Brazilian test and that the Griffith criterion can be fulfilled if the equivalent stress is calculated. Additionally, the orientation of the forces in the contact between the loading device and the disc has been studied for different friction conditions. According to the numerical results, it was found that a loading arc configuration of 20º shows the best agreement with the probable values given by the analytical stress model when the uncertainty of its magnitudes is taken into account. The study also demonstrates that the friction in the contact between the optimal loading configuration and the disc does not seem to significantly affect the theoretical predictions in the centre of the disc.

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Section: Introductionmentioning

confidence: 99%

Computational Verification of the Optimum Boundary Condition of the Brazilian Tensile Test

et al. 2018

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“…Bulk sandstone cubes were extracted from a quarry in Queensland, Australia, cut into 50 mm-sized cubes, ground on all six faces to ensure their smoothness and perpendicularity, and oven-dried at 50°C for 24 hr before testing, based on past studies [35,36,37]. A multi-functional true triaxial testing facility is available in the Geotechnical Engineering Centre (GEC) at The University of Queensland, with the ability to conduct three-dimensional loading through orthogonal loading platens in the direction of major (𝜎 1 ), intermediate (𝜎 2 ) and minor (𝜎 3 ) principal stresses, measure rock permeability with up to 10 MPa pressure, hydraulic fracture up to 52 MPa hydraulic pressure, coupled thermo-mechanical testing with an elevated temperature up to 100°C, and designed to accommodate AE and ultrasonic for the assessment of progressive damage [38,39] (Figure 2).…”

Section: Methodsmentioning

confidence: 99%

Coupled Thermo-Mechanical Study of Crack Initiation Stress Threshold in Porous Sandstone

Moravej

Mutaz²,

Serati³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The increasing depth of tunnels and underground mining operations worldwide has resulted in the rise of deep mines at temperatures well above 50°C. Such unwanted thermal gradients not only adversely impact the physical and mechanical behaviours of the rock mass but could also affect the safety of underground mines leading to temporarily and permanently shutting down the operation. The combination of high temperature and high-stress conditions further culminates in explosion-like fractures like rockburst and spalling, which are the main problems in deep mining and tunnel constructions. Spalling is identified as an abrupt explosion-like rock failure that occurs spontaneously and can endanger tunnelling and mining operations, causing injuries and fatalities, and necessitating investigation of the effect of temperature on rock behaviour. It is known that the spalling strength is correlated with the internal crack initiation in low-porosity and brittle crystalline rocks. This paper investigates this phenomenon and examines the influence of coupled thermo-mechanical conditions on the crack initiation stress level of sandstone samples. True triaxial compression tests were carried out on 50 mm sandstone cubes from room temperature (25°C) to 100°C using a high temperature true triaxial testing facility. The results suggest that temperature can have a significant impact on crack initiation and the spalling strength of rock, particularly at low confinement.

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“…One can also define a complete three-dimensional (3D) stress-strain tensor for any arbitrary point inside a 3D Brazilian disc using Airy stress functions, displacement potentials, and double Fourier series techniques [16][17][18]. When loaded under a biaxial stress state with a ratio of lateral to vertical force of k, the central stress can be written in terms of Equation (3) using the principle of superposition.…”

Section: Theoretical Frameworkmentioning

confidence: 99%

Biaxial Loading of Brazilian Disc Samples

Serati

Mottaghi

Williams

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The Brazilian test method has been widely used over the past 50 years to determine the indirect tensile strength of brittle materials, such as rocks and concrete. While the behaviour of Brazilian samples under conventional indirect tensile testing has been the subject of much research, the biaxial loading of a Brazilian sample under both horizontal and vertical compressive forces has rarely been studied. This study investigates the ultimate strength, crack propagation speed, fracture mode, and damage evolution in sandstone Brazilain samples using high-speed photography methods integrated with a newly designed hybrid biaxial-impact testing facility. The result shows that the samples fail under lower tensile stress than their Indirect Tensile Strength based on the principle of superposition.

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The Brazilian Disc Test Under a Non-Uniform Contact Pressure Along Its Thickness

Cited by 11 publications

References 9 publications

Computational Verification of the Optimum Boundary Condition of the Brazilian Tensile Test

Computational Verification of the Optimum Boundary Condition of the Brazilian Tensile Test

Coupled Thermo-Mechanical Study of Crack Initiation Stress Threshold in Porous Sandstone

Biaxial Loading of Brazilian Disc Samples

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