Influence of Specimen Shape on the Indirect Tensile Strength of Transversely Isotropic Dionysos Marble Using the Three‐Point Bending Test

Kaklis, K.; Maurigiannakis, S.; Agioutantis, Z.; Istantso, C.

doi:10.1111/j.1475-1305.2008.00560.x

Cited by 15 publications

(6 citation statements)

References 18 publications

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“…Characterization of tensile strength is an important parameter in rock engineering . Although some authors have even suggested that the tensile strength should not be considered as a material property , it is often the critical mechanical parameter in the engineering practice involving rocks . It governs the failure of rock masses in problems such as the stability of mining roofs, galleries and in drilling and blasting .…”

Section: Introductionmentioning

confidence: 99%

“…When the tensile strength are also easily available, the strength ratio defined described as the ratio of compressive to tensile strength could be used as a good substitute for some material constants (m i and a ) in Hoek‐Brown failure criteria . In addition, the behavior of rocks in tension may be an effective indicator of their microstructure, and hence state of weathering determined using tensile strength .…”

Section: Introductionmentioning

confidence: 99%

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Modeling of tensile strength of rocks materials based on support vector machines approaches

Ceryan

Okkan

Samui

et al. 2012

Num Anal Meth Geomechanics

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In the predicting of geological variables, artificial neural networks (ANNs) have some drawbacks including possibility of getting trapped in local minima, over training, subjectivity in the determining of model parameters and the components of its complex structure. Recently, support vector machines (SVM) has been found to be popular in prediction studies due to its some advantages over ANNs. Because the least squares SVM (LS-SVM) provides a computational advantage over SVM by converting quadratic optimization problem into a system of linear equations, LS-SVM method is also tried in study. The main purpose of this study is to examine the capability of these two SVM algorithms for the prediction of tensile strength of rock materials and to compare its performance with ANN and linear regression (MLR) models. Total porosity, sonic velocity, slake durability index and aggregate impact value were used as input in modeling applications. Favorite performance evaluation measures were employed to assess developed models. The results determined in study indicate that the SVM, LS-SVM and ANN methods are successful tools for prediction of tensile strength variable and can give good prediction performances than MLR model. Although these three methods are powerful artificial intelligence techniques, LS-SVM makes the running time considerably faster with the higher accuracy. In terms of accuracy, the LS-SVM model resulted in error reductions relative to that of the other models.Tensile strength was used for different geotechnical aims, and laboratory and full-scale studies were carried out to explore the possible relationship between fine production and water content of rock material [11]. Results of the laboratory work showed that the percentage of fines fraction produced by a cone crusher machine was a function of the type of rock tested and the tensile strength of individual specimens [11].There are mainly two methods for determining the tensile strength of rock materials. One of the methods is laboratory tests including direct uniaxial tensile test and indirect tensile tests (direct method) or making use of the previously derived empirical equations from literature called as indirect method. Direct uniaxial tensile test have some disadvantages and limitations. This test, which is theoretically the simplest and most effective method for the determination of tensile strength, is in fact difficult to carry out in practice for rock material and the difficulty in specimen preparation [4,9,[12][13][14][15][16]. Therefore, to determine tensile strength, indirect tensile tests are developed, for example Brazilian test, ring test, hoop test, bending test, etc. Brazilian test which is much more popular among those carried out has been proved as a satisfactory technique for determining the tensile strength of many rocks [6,[8][9][10][11][17][18][19][20]. Brazilian test measures tensile strength indirectly by developing tension across the diameter of a rock disc that is subjected to compression through a vertical load [8]. Testing proc...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling of tensile strength of rocks materials based on support vector machines approaches

Ceryan

Okkan

Samui

et al. 2012

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

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“…(v) The bending strength of stone tiles depends on the thickness to width ratio, as well as on the type of stone [23]. The quality of these natural products, which is the result of physical (e.g., porosity) and mechanical properties of the stone, can vary significantly even for blocks extracted from the same quarry [24].…”

Section: Flooringsmentioning

confidence: 99%

A Proposal to Improve the Effectiveness of the Deflection Control Method Provided by Eurocodes for Concrete, Timber, and Composite Slabs

D’Antino

Pisani

2021

Materials

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Limited deflection of structural members represents an important requirement to guarantee proper functionality and appearance of building and infrastructures. According to Eurocodes, this requirement is ensured by limiting the maximum deflection of horizontal structural members to a fraction of their span. However, each Eurocode provides different maximum deflection limits, which are independent of the type of superstructures considered. Thus, the respect of these limits may not always guarantee the integrity of certain superstructures. In this paper, the reliability of the Eurocode deflection control methods, in guaranteeing the integrity of the superstructures, is assessed and discussed. First, different types of horizontal member, namely rib and clay (hollow) pot, composite steel–concrete, and timber beam slabs are designed to respect the deflection limit enforced by the Eurocodes. Then, the maximum curvature developed by these members is compared with the ultimate (limit) curvatures of various superstructures (e.g., ceramic and stone tile floorings). The results obtained show that the approach adopted by Eurocode 2 may provide non-conservative results, but also that the rules proposed by Eurocodes 4 and 5, albeit more reliable, do not always guarantee the integrity of the superstructure. Based on these results, an alternative method, based on the curvature control, is proposed and its advantages and limitations critically discussed. This method appears simpler and more reliable than the method currently adopted by the Eurocodes.

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“…Substituting equation 9into equation (19) and simplifying it, the space-time evolution equation of the bending neutral layer can be derived as Figure 2. e testing equipment used in the test included WAW-1000 kN microcomputer controlled electro-hydraulic servo universal testing machine (Figure 3(a)), DH3818 static strain data acquisition instrument (Figure 3(b)), and the PCI-2 type acoustic emission system (Figure 3(c)).…”

Section: Space-time Evolution Equation Of the Bending Neutralmentioning

confidence: 99%

“…Lu et al [18] conducted a series of threepoint bending tests on sandstone beam specimens with type I precracks to study the microcracks and microscopic deformation behavior of samples during real-time loading. Kaklis et al [19] focused on the investigation of the threepoint bending tensile strength of Dionysos marble and compared the calculated bending tensile strength with the corresponding value obtained from Brazilian indirect tension as well as ring tests. Zhang et al [20] studied the damage and fracture process of three-point bending notched sandstone beams by combining the three-point bending test together with the digital image correlation (DIC) and acoustic emission (AE) techniques.…”

Section: Introductionmentioning

confidence: 99%

Study on Bending Damage Constitutive Model and Mechanical Properties of Limestone Based on Acoustic Emission

Zhang

Zuo

et al. 2019

Advances in Civil Engineering

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To reveal the mechanical characteristics and damage evolution mechanism of limestone in the bending process, the cumulative acoustic emission (AE) hits were used to define the damage variable, and the rock microbody hypothesis and the Weibull distribution function were applied to further improve the damage variable. Meanwhile, the bending damage constitutive model of limestone under three-point bending was developed based on the Lemaitre strain equivalence principle and the continuum damage theory. Then, the three-point bending test with acoustic emission monitoring was carried out to verify the rationality and validity of the model. Results showed that the modified damage variable D had an exponential distribution with the strain ε, and the damage was mainly concentrated in the macrocrack propagation stage. Moreover, the bending neutral layer moved towards the compressive zone in the bending damage process. The bending neutral layer, furthermore, moved slowly a small distance at the initial stage of bending fracture but moved fast a long distance at the end stage of bending fracture. In addition, the bending damage constitutive model could be quantitatively expressed by the cumulative AE hits Np, the stress σ, the strain ε, and Young’s modulus E. The theoretical stress-strain model curves agreed well with experimental results, which demonstrated that the proposed model could capture the damage evolution of limestone reasonably in the bending process.

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Influence of Specimen Shape on the Indirect Tensile Strength of Transversely Isotropic Dionysos Marble Using the Three‐Point Bending Test

Cited by 15 publications

References 18 publications

Modeling of tensile strength of rocks materials based on support vector machines approaches

Modeling of tensile strength of rocks materials based on support vector machines approaches

A Proposal to Improve the Effectiveness of the Deflection Control Method Provided by Eurocodes for Concrete, Timber, and Composite Slabs

Study on Bending Damage Constitutive Model and Mechanical Properties of Limestone Based on Acoustic Emission

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