Comparative analysis on rock strength criterion under considering of tensile strength

2014 ◽  
pp. 147-152 ◽  
Keyword(s):  
Tensile Strength ◽  
Comparative Analysis ◽  
Rock Strength ◽  
Strength Criterion ◽  
Rock Strength Criterion

scholarly journals Rock strength criterion considering the effect of hydrostatic stress on lode angle effect

2019 ◽  
Vol 7 (4) ◽  
pp. 1166-1177
Author(s):  
Zhenlong Song ◽  
Minghui Li ◽  
Guangzhi Yin ◽  
Pathegama Gamage Ranjith ◽  
Chao Liu
Keyword(s):  
Rock Strength ◽  
Hydrostatic Stress ◽  
Strength Criterion ◽  
Angle Effect ◽  
Lode Angle ◽  
Rock Strength Criterion

scholarly journals Constitutive Model of Rock Uniaxial Damage Based on Rock Strength Statistics

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Ming Ji ◽  
Kai Chen ◽  
Hong Jun Guo
Keyword(s):  
Constitutive Model ◽  
Rock Strength ◽  
Strength Criterion ◽  
Uniaxial Stress ◽  
Evolution Process ◽  
Growth Stages ◽  
Numerical Fitting ◽  
Damage Constitutive Model ◽  
Log Normal

Based on the assumption that rock strength follows the log normal distribution statistically, this paper establishes a damage constitutive model of rock under uniaxial stress conditions in combination with the Mohr–Coulomb strength criterion and damage mechanical theory. Experiments were carried out to investigate the damage evolution process of rock material, which can be categorized into nondamaging, accelerated growth, constant-speed, similar growth, and speed-reducing growth stages. The evolution process had a good corresponding relationship with the rock stress-strain curves. Based on the statistical damage constitutive model proposed in this paper, a numerical fitting analysis was conducted on the uniaxial compression testing data of laboratory sand rock and on experimental data from other literature, in order to validate the rationality of the constitutive equation and the determination of its parameters and to analyze the effect of internal friction variables on damage variables and compression strength. The research outcomes presented in this paper can provide useful reference for the theory of rock mechanics and for rock engineering.

Effect of the Gel Coat Composition on the Tensile Strength for Glass Fibre Reinforced Polyester Composites

2015 ◽  
Vol 1125 ◽  
pp. 79-83 ◽  
Author(s):  
Ahmad ◽  
M.R. Abdullah ◽  
Ab. Saman Abd Kadir
Keyword(s):  
Tensile Strength ◽  
Comparative Analysis ◽  
Glass Fibre ◽  
Gfrp Composites ◽  
Composite Surface ◽  
A Value ◽  
Before And After ◽  
Glass Fibre Reinforced ◽  
Polyester Composites ◽  
The Difference

In this study, the effect of the gel coat composition on tensile strength of glass fibre reinforced polyester (GFRP) composites was evaluated. The experiments were conducted on various gel coat composition and time. Samples were immersed in sea and river water for 6 months to investigate the differences in tensile strength. Optical observation using SEM on the composites surface and comparative analysis in terms of tensile strength were used before and after immersing. As results, the most excellent tensile strength was the gel coat composition consisting of 0.3 kg of reolosil QS-102 with 10 kg of resin SHCP 268BQTN with a value of 51.9 MPa. Tensile strength reduced about 33.4 % compared to other sample where reduced to 46.3401 %. The difference in the composite surface as a result of immersion process on each sample was also discussed in this paper.

scholarly journals Three-Dimensional Numerical Analysis of the Tunnel for Polyaxial State of Stress

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Wenge Qiu ◽  
Chao Kong ◽  
Kai Liu
Keyword(s):  
Numerical Simulation ◽  
Mechanical Behavior ◽  
Principal Stress ◽  
Failure Criterion ◽  
Rock Strength ◽  
Strength Criterion ◽  
Intermediate Principal Stress ◽  
State Of Stress ◽  
Coulomb Failure ◽  
Coulomb Failure Criterion

The aim of this study is to have a comprehensive understanding of the mechanical behavior of rock masses around excavation under different value of intermediate principal stress. Numerical simulation was performed to investigate the influence of intermediate principal stress using a new polyaxial strength criterion which takes polyaxial state of stress into account. In order to equivalently substitute polyaxial failure criterion with Mohr-Coulomb failure criterion, a mathematical relationship was established between these two failure criteria. The influence of intermediate principal stress had been analyzed when Mohr-Coulomb strength criterion and polyaxial strength criterion were applied in the numerical simulation, respectively. Results indicate that intermediate principal stress has great influence on the mechanical behavior of rock masses; rock strength enhanced by intermediate principal stress is significant based on polyaxial strength criterion; the results of numerical simulation under Mohr-Coulomb failure criterion show that it does not exert a significant influence on rock strength. Results also indicate that when intermediate principal stress is relatively small, polyaxial strength criterion is not applicable.

Molecular dynamics study on the tensile properties of graphene/Cu nanocomposite

2017 ◽  
Vol 06 (03) ◽  
pp. 1750021 ◽  
Author(s):  
Jun Hua ◽  
Zhirong Duan ◽  
Chen Song ◽  
Qinlong Liu
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Comparative Analysis ◽  
Strain Rate ◽  
Ultimate Strength ◽  
Strain Rates ◽  
Single Crystal Copper ◽  
Single Slice

In this paper, the mechanical properties, including elastic properties, deformation mechanism, dislocation formation and crack propagation of graphene/Cu (G/Cu) nanocomposite under uniaxial tension are studied by molecular dynamics (MD) method and the strain rate dependence is also investigated. Firstly, through the comparative analysis of tensile results of single crystal copper (Cu), single slice graphene/Cu (SSG/Cu) nanocomposite and double slice graphene/Cu (DSG/Cu) nanocomposite, it is found that the G/Cu nanocomposites have larger initial equivalent elastic modulus and tensile ultimate strength comparing with Cu and the more content of graphene, the greater the tensile strength of composites. Afterwards, by analyzing the tensile results of SSG/Cu nanocomposite under different strain rates, we find that the tensile ultimate strength of SSG/Cu nanocomposite increases with the increasing of strain rate gradually, but the initial equivalent elastic modulus basically remains unchanged.

Two-Parameter Parabolic Mohr Strength Criterion Applied to Analyze the Results of the Brazilian Test

2014 ◽  
Vol 624 ◽  
pp. 630-634 ◽  
Author(s):  
Qi Fan ◽  
Shuan Cheng Gu ◽  
Bo Nan Wang ◽  
Rong Bin Huang
Keyword(s):  
Tensile Strength ◽  
Stress State ◽  
Tensile Stress ◽  
Failure Modes ◽  
Strength Criterion ◽  
Complex Stress State ◽  
Brazilian Test ◽  
Practical Significance ◽  
Uniaxial Tensile ◽  
Two Parameter

Geotechnical engineering in tension damage is one of the major failure modes. For a long time, Brazil test has practical significance and wide application value that has been used to determine the tensile strength of rock. When the specimen center destroyed tensile stress play a major role that is the theoretical basis of Brazil test. This is uniaxial tensile stress state, but the reality is complex stress state. Theoretical analysis shows that the Brazilian test does not truly reflect the tensile strength of rock, its test results to error. In this paper, two-parameter parabolic Mohr strength criterion for this error analysis, and propose amendments to the formula.

scholarly journals COMPARATIVE ANALYSIS OF THE TENSILE STRENGTH AND BREAKING EXTENSION OF THE SHEEP, GOAT AND SHEEP/GOAT FELT FABRICS

2021 ◽  
pp. 10-14
Author(s):  
E.S Nwadiokwu ◽  
O.K Sunmonu ◽  
A.S Lawal ◽  
B.M Dauda
Keyword(s):  
Tensile Strength ◽  
Comparative Analysis ◽  
Fibre Characteristics

The comparative analysis of the tensile strength and breaking extension of the sheep, goat and sheep/goat blend has been done. This research shows that the sheep felt fabrics has higher tensile strength followed by the sheep/goat felt fabric and lastly by the goat felt fabrics. While the goat felt fabrics has higher breaking extension followed by the sheep/goat felt fabrics and lastly by the sheep felt. This can be attributable to the nature of their felt fabrics which depends on their fibre characteristics. The sheep felt fabric is regarded as a strong fabric and less extensible because of the ease in which the protruding fibre scales interlocks and therefore can withstand more stress. The goat felt fabric has higher breaking extension properties because of the elastic nature of their fibres and as such can be regarded as a tough fabric.

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