Application of the Brazilian Disc Test for Strength Measurements on Ceramic Green Bodies

2002 ◽  
pp. 159-167 ◽  
Author(s):  
M. Hangl ◽  
A. Börger ◽  
R. Danzer ◽  
H. M. Luxner
Keyword(s):  
Brazilian Disc ◽  
Brazilian Disc Test

scholarly journals A numerical and experimental study on the tensile behavior of plasma shocked granite under dynamic loading

2017 ◽  
Vol 50 (2) ◽  
pp. 41-62
Author(s):  
Ahmad Mardoukhi ◽  
Timo Saksala ◽  
Mikko Hokka ◽  
Veli-Tapani Kuokkala
Keyword(s):  
Experimental Study ◽  
Tensile Strength ◽  
Mechanical Behavior ◽  
Thermal Shock ◽  
Dynamic Loading ◽  
Split Hopkinson Pressure Bar ◽  
Tensile Behavior ◽  
Brazilian Disc ◽  
Brazilian Disc Test ◽  
Plasma Shock

This paper presents a numerical and experimental study on the mechanical behavior of plasma shocked rock. The dynamic tensile behavior of plasma shock treated Balmoral Red granite was studied under dynamic loading using the Brazilian disc test and the Split Hopkinson Pressure Bar device. Different heat shocks were produced on the Brazilian disc samples by moving the plasma gun over the sample at different speeds. Microscopy clearly showed that as the duration of the thermal shock increases, the number of the surface cracks and their complexity increases (quantified here as the fractal dimension of the crack patterns) and the area of the damaged surface grows larger as well. At the highest thermal shock duration of 0.80 seconds the tensile strength of the Brazilian disc sample drops by approximately 20%. In the numerical simulations of the dynamic Brazilian disc test, this decrease in tensile strength was reproduced by modeling the plasma shock induced damage using the embedded discontinuity finite element method. The damage caused by the plasma shock was modeled by two methods, namely by pre-embedded discontinuity populations with zero strength and by assuming that the rock strength is lowered and conform to the Weibull distribution. This paper presents a quantitative assessment of the effects of the heat shock, the surface microstructure and mechanical behavior of the studied rock, and a promising numerical model to account for the pre-existing crack distributions in a rock material.

scholarly journals Comparative Study on the Test Method for Tensile Elastic Modulus of Rock Materials

2019 ◽  
Vol 2019 ◽  
pp. 1-18
Author(s):  
Yan Zhang ◽  
Dawei Yu
Keyword(s):  
Elastic Modulus ◽  
Comparative Investigation ◽  
Test Method ◽  
Bending Test ◽  
Brazilian Disc ◽  
Rock Materials ◽  
Brazilian Disc Test ◽  
Test Operation ◽  
Uniaxial Compressive Test ◽  
Tensile Elastic Modulus

Rock material has different mechanical behaviors under compressive and tensile loading. Correspondingly, there are two types of elastic modulus: compressive elastic modulus Ec and tensile elastic modulus Et, respectively. To distinguish which indirect test methodology, including three-points bending test and Brazilian disc test, is more suitable to measure the tensile elastic modulus Et of rock materials, a series of uniaxial compressive test (UCT), direct tensile test (DTT), three-points bending test, and Brazilian disc test are performed for three typical types of rock: marble, granite, and sandstone. Comparative investigation on the reliability of measurement results of tensile elastic modulus Et is systematically conducted. Finally, it is found that Brazilian disc test could be a suitable method to measure tensile elastic modulus of rock materials, due to the excellent agreement with that measured by DTT and the simplicity of sample preparation, as well as test operation.

Location of the Crack Initiation Points in the Brazilian Disc Test

2014 ◽  
Vol 32 (5) ◽  
pp. 1339-1345 ◽  
Author(s):  
Hang Lin ◽  
Wei Xiong ◽  
Wenwen Zhong ◽  
Caichu Xia
Keyword(s):  
Crack Initiation ◽  
Brazilian Disc ◽  
Brazilian Disc Test
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