موقعك الحالي:صفحة رئيسية>المنتجات
CONCLUSIONS (1) The tensile strength of rock is generally greatest when the applied tensile stress is at 0to the laminations and smallest at 90to the laminations. (2) The maximum variation in tensile strength with lamination orientation is shown by the lightly laminated Ormonde Siltstone 2 and is about 3.5:1.
Read More
Results are given of tensile strength measurements made on rock using the diametrical compression of a disk with a central hole as a technique for determining tensile strength. Detailed quantitative information of the variation of the tensile strength with lamination orientation is given. It is shown that a relationship may exist between the ...
Read More
1978-8-1 In this connection an indirect tensile strength measurement is understood to mean loading a rock sample with compressive forces in such a way that ten- sile normal stresses are generated in certain directions and parts of the sample. The sample breaks so that the direction of maximum tensile stress is roughly nor- mal to the fracture surface.
Read More
2019-7-1 To comprehensively understand the tensile strength properties of F-T-affected transversely isotropic rocks, a prediction model, in which a symmetric tensile strength tensor was employed to describe the directional dependency of the strength and two principal parameters (T 0 and T 90) were introduced to consider the F-T damage, was proposed based on Nova and Zaninetti's tensile failure theory and experimental data. It was determined that the simulated variations in the tensile strength
Read More
2018-8-1 The experimental results show that the tensile strength of rocks is sensitive to strain rate. At lower strain rate, the stress equilibrium state is satisfied preceding the crack initiation and results in sequential fracturing of the splitting crack in the specimen.
Read More
2020-8-27 In average, tensile strength of rock is roughly equal to 10% of its compressive strength value. Thus, a rock is more likely to fail in tension than in compression (Gao, 2017).
Read More
2020-5-1 These problems can be solved by the microwave treatment of hard rocks during cutting. In this study, the effects of microwave treatment were investigated on the strength of nine different igneous rocks. First, the uniaxial compressive strength (UCS) and Brazilian tensile strength (BTS) tests were carried out on the untreated samples.
Read More
In this study, the effects of microwave treatment were investigated on the strength of nine different igneous rocks. First, the uniaxial compressive strength (UCS) and Brazilian tensile strength (BTS) tests were carried out on the untreated samples. Then, the strength tests were performed on the microwave treated specimens.
Read More
tensile strength of rocks. the most often used methods of measuring the tensile strength of rocks are the direct tensile test and the brazilian test. this report studies both methods in detail and interprets them as a function of the existence of discontinuities in the rock. the brazilian test can only be regarded as a valid tensile test if a ...
Read More
2021-6-28 2. Determination of the Values of Compressive and Tensile Strength of Rocks—General Information The goal of the current studies, the results of which are presented in this work, was to determine two material constants: the compressive strength Rc and the tensile strength Rr. This selection was dictated by the fact that investment stakeholders ...
Read Moretensile strength of rocks. the most often used methods of measuring the tensile strength of rocks are the direct tensile test and the brazilian test. this report studies both methods in detail and interprets them as a function of the existence of discontinuities in the rock. the brazilian test can only be regarded as a valid tensile test if a ...
Read More
2020-11-2 The tensile strength of rocks - ScienceDirect. For Babbington Mudstone the ratio of the tensile and compressive strengths is much higher than the ratio for the other rocks tested and if the results for Babbington Mudstone are excluded from the calculation, then the correlation coefficient for the comparison between the tensile and compressive strengths of massive rocks is 0.861 which is ...
Read More
2012-9-17 Predicting the compressive and tensile strength of rocks from indentation hardness index Equation [1] was obtained from the IHI testing performed on ultramafic and basaltic rocks. In this study, the relation between IHI and both UCS and BTS was investigated for igneous, metamorphic, and sedimentary rocks.
Read More
OSTI.GOV Journal Article: Tensile strength of rocks subjected to explosive loading. [4 refs]
Read More
2016-7-20 strength of the rocks tested. But tensile strength of ice, i.e, 1.37 MPa at O°C and 2.45 MPa at -SO°C is quite near to tensile strength of rocks tested", Therefore, it can be said that ice contributed to the tensile strength but not to the uniaxial compressive strength of rocks. Besides this, ice also acted as an
Read More
The tensile strength of rocks - ScienceDirect . Results are given of tensile strength measurements made on rock using the diametrical compression of a disk with a central hole as a technique for determining t . Predicting the unconfined compressive strength of the ...
Read More
2014-10-22 Dynamic tensile strength expe riments on rocks have been carried out by Grady and Hollenbach (1979), Cohn and Ahrens (1981), Lange et al. (1 984), Ahrens and Rubin (1993), and others. Previously, three quantitative methods have been used to determine the dynamic tensile strength. These are: 1) the free-surface velocity pullback signal method ...
Read More
An ideal test geometry was proposed (the depth and the width of the partial core were 2.5 and 0.4 cm, respectively). The POT can overestimate or underestimate the tensile strength of the rock, depending on the cohesive fracture energy, and a correction equation was proposed for visually homogeneous rocks
Read More
The number of intragrain tensile cracks increases and the number of intergrain shear cracks decreases with increasing H e, when the axial stress reached the rock peak strength. Besides, the combined effects of material heterogeneity and mineral content may control the type and number of microcracks, further weakening the effect of grain size ...
Read More
2011-11-29 The tensile strength of rocks is much lower than its compressive strength. Rock is a brittle material and because all brittle materials are weak in tension, the tensile strength of rock becomes one of the most important parameters influencing its deformability and fracture toughness. The difficulties associated with performing a direct uniaxial ...
Read More
2005-6-2 This paper reports on a comparative study of various types of experimental tests for measuring the tensile strength of rocks and rock-like materials. A critical assessment is presented of some widely used laboratory techniques on the basis of experimental data from the literature and from the laboratory investigation performed in this study.Tests were carried out using a triaxial apparatus ...
Read More
2021-7-11 Available online at sciencedirect ScienceDirect Energy Procedia 00 (2017) 000–000 ... stresses exceeding the rock's tensile strength, was modelled numerically [5]. These tensile, thermal stresses will occur ... This geometry is commonly advocated for the standard indirect tensile test for rocks, the so-called Brazilian test.
Read More2009-2-23 8.2 TENSILE STRENGTH The tensile strength of soil is very low or negligible and in most analyses it is considered to be zero. In contrast a number of direct or indirect tensile strength tests are commonly carried out for rock. In a direct tensile strength test a cylindrical rock specimen is stressed along its axis by means of a tensile force.
Read MoreRock Strength - an overview ScienceDirect Topics. Rock strength and porosity have good correlations for various rocks, and porosity ... Rock strength is specified in terms of tensile strength, compressive strength
Read More2014-10-22 Dynamic tensile strength expe riments on rocks have been carried out by Grady and Hollenbach (1979), Cohn and Ahrens (1981), Lange et al. (1 984), Ahrens and Rubin (1993), and others. Previously, three quantitative methods have been used to determine the dynamic tensile strength. These are: 1) the free-surface velocity pullback signal method ...
Read MoreThe number of intragrain tensile cracks increases and the number of intergrain shear cracks decreases with increasing H e, when the axial stress reached the rock peak strength. Besides, the combined effects of material heterogeneity and mineral content may control the type and number of microcracks, further weakening the effect of grain size ...
Read More
2021-5-18 The compressive and tensile strengths of the gypsum and limestone rocks varied from 2 to 250 MPa and 1.8 to 25 MPa, respectively. The compressive modulus and Mode-1 fracture toughness of the gypsum and limestone rocks varied from 0.7 to 70 GPa, and from 0.03 to 2 MPa.m 0.5, respectively. Vipulanandan correlation model was effective in relating ...
Read More
In Brazilian test, a circular disk placed between two platens is Brazilian tensile strength (BTS) was found out following the loaded in compression producing a nearly uniform tensile stress equation suggested by ASTM D3967 [28]: distribution normal to the loaded diametral
Read More
Abstract. Estimating in-situ stress with hydraulic borehole fracturing involves tensile strength of rock. Several strength criteria with three parameters result in tensile strengths with great differences, although they may describe the relation between strength of rock and confining pressure with low misfits.
Read More
2020-9-13 7. The relationship between direct tensile strength and indirect tensile strength values of various types of rocks. It is well known that tensile strength determined from direct (pull test) and indirect (Brazilian test) methods are rarely equiva-lent. Several researchers reported that the Brazilian indirect tensile
Read More
الصين -تشنغ تشو -المنطقة الوطنية للتنمية الصناعية للتكنولوجيا المتطورة، جادة العلوم رقم 169.
الاتصال: 0371-86549132.