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.

Experimental Study of the Mechanical Properties of the Composite Materials Hose

2012 ◽  
Vol 496 ◽  
pp. 3-6 ◽  
Author(s):  
Zhi Wang ◽  
Wen Wen Liu ◽  
Yun Hai Du
Keyword(s):  
Elastic Modulus ◽  
Composite Materials ◽  
Uniaxial Tension ◽  
Tension Test ◽  
Bending Test ◽  
Design Parameters ◽  
Design System ◽  
Uniaxial Tension Test ◽  
Three Point Bending ◽  
Tensile Elastic Modulus

The tensile elastic modulus, bend elastic modulus and tensile strength of the composite materials hose were determined by uniaxial tension test and three point bending test. The specimen was first destroyed from the inner or outer layer rubber, and then the spiraled cords threads was pulled out and the specimen destroyed with irregular fracture shape. According to the test results, the flexible hose can be considered as linear elastic material because the deformation showed a linear relationship with the external load in uniaxial tension test and three point bending test. The bend elastic modulus EB is much smaller than the tensile elastic modulus ET. The calculation results used EB show a good consistency with the test result and the EB should be selected as design parameters and the design system would be more secure.

scholarly journals Energy Dissipation Characteristic of Red Sandstone in the Dynamic Brazilian Disc Test with SHPB Setup

2020 ◽  
Vol 2020 ◽  
pp. 1-10 ◽  
Author(s):  
Fengqiang Gong ◽  
Jian Hu
Keyword(s):  
Energy Dissipation ◽  
Incident Energy ◽  
Split Hopkinson Pressure Bar ◽  
Critical Energy ◽  
Dissipated Energy ◽  
Brazilian Disc ◽  
Red Sandstone ◽  
Rock Materials ◽  
Brazilian Disc Test ◽  
Dissipation Characteristic

In order to quantitatively investigate the energy dissipation characteristic during the dynamic tension failure of rock materials, the dynamic Brazilian disc tests on red sandstone were conducted using the split Hopkinson pressure bar (SHPB) setup. The states of the specimens after different incident energies can be divided into three forms (i.e., the unruptured state, the ruptured state, and the broken state), and the failure processes of the specimens were recorded by using a high-speed camera. The results show that the ruptured state of the specimen corresponds to the critical failure strain. Taking the critical incident energy as a turning point, two positive linear fitting relations between the dissipated energy and incident energy before and after the point are obtained, and the dynamic linear dissipation law is found. When the incident energy is less than the critical energy, specimens were unruptured after impact. When the incident energy is greater than the critical energy, specimens will be broken after impact. According to the obtained linear energy dissipation law, the dynamic tensile energy dissipation coefficient (DTEDC) was introduced for quantitatively describing the dynamic energy dissipation capacity of rock materials in the dynamic Brazilian disc test. When the specimen is in the unruptured state, the ideal DTEDC is a constant value. When the specimen is in a broken state, the DTEDC increases with the increase of incident energy.

The Contrast of Concrete Brazilian and Flattened Brazilian Disc Specimen under Quasi Static Diametral Compression Tests

2014 ◽  
Vol 507 ◽  
pp. 263-268
Author(s):  
Pei Liang ◽  
Jun Lin Tao
Keyword(s):  
Mechanical Properties ◽  
Test Specimen ◽  
Test Method ◽  
Compression Tests ◽  
Brazilian Disc ◽  
Disc Specimen ◽  
Diametral Compression ◽  
Brazilian Disc Test ◽  
Force Curves ◽  
Rock Mechanical Properties

Reference the test method of the rock mechanical properties, through the concrete Brazilian and flattened Brazilian disc specimen under quasi static diametral compression tests and compared, research shows that flattened Brazilian disc specimens split eventually destroy the formation more than one cracks, on both sides along the platform has large cracks, even cracks in some specimens from the platform to the next platform throughout the ipsilateral endpoint, and complete Brazilian disc does not appear this phenomenon. Complete Brazilian disc specimens and flattened Brazilian disc test specimen loading force curves form remains the same, but flattened Brazilian disc specimens eventually reach the extreme loading force has a higher value than the first extreme loading force.

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