Yazar "Akbay, D." seçeneğine göre listele

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    Estimation of Specific Cutting Energy and Noise Level in Circular Saw Cutting Process by Leeb, Shore and Schmidt Hardness Values of Rocks
    (Pleiades Publishing Inc, 2023) Ekincioglu, G.; Akbay, D.
    In this study, the rebound hardness values (Shore-Schmidt-Leeb) were calculated for 12 different carbonate rocks using three different devices. The relationships between hardness values and rock cuttability properties (specific cutting energy and noise level) were investigated by simple and multiple regression analyses. It is determined that the Leeb hardness of the rocks can be an alternative to the Shore hardness and Schmidt hardness and that both the specific cutting energy and the noise level can be estimated with the Leeb hardness values.
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    Öğe
    Point Load Index Applicability to Predicting Rocks' Uniaxial Compressive and Tensile Strengths: Available Data Analysis and FEM-Based Validity Check
    (Springer, 2024) Akbay, D.
    In projects that are in contact with rocks, it is very important to determine the strength parameters of the rock correctly. While there are several approaches to this, the experimental approach is the most recommended. The strength of the rocks is determined by laboratory experiments. However, these experiments can sometimes be complicated, time-consuming, expensive, or samples with the required size cannot be prepared. In such cases, index, simpler, and cheaper test methods can be used to estimate the strength values. Many studies have used point load index (PLI) to predict uniaxial compressive strength (UCS). This study investigated whether PLI predicts UCS or Brazilian tensile strength (BTS) better. A data set was created from the studies with UCS, BTS, and PLI values, which were determined using the same rock samples in the literature. The finite element approach was used to analyze the stress distributions on the samples to explain better the results obtained. As a result, it was seen that PLI can be used reliably in magmatic and metamorphic rocks to predict both UCS and BTS. It was determined that PLI predicted BTS better and that the stress distributions formed on the sample at the time of the experiment were very similar to those of the BTS test.
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    Öğe
    Reliability and evaluation of point load index values obtained from different testing devices
    (Southern African Inst Mining Metallurgy, 2020) Akbay, D.; Altindag, R.
    In some rock mass classification methods, the point load index (PLI) value is used as a parameter in the determination of the class of rock mass. The PLI value may be used as a design parameter such as uniaxial compressive strength (UCS) and tensile strength (TS), owing to its being simpler, faster, and cheaper and easier to prepare than the specimens for UCS and TS tests. It can also be carried out in both the field and the laboratory. Many researchers have investigated PLI testing and the effect of different loading configurations, sample size, and size correction factors. Within the scope of this study, PLI tests were performed in 15 different point load index testing devices. The experiments were carried out on seven different rock types (three sedimentary, one metamorphic, three magmatic) by the same operator. The errors of the testing devices were investigated based on the experimental results, and a device was modified to avoid the errors identified. Additional experiments were carried out in the modified testing device to acquire more realistic values. The PLI values obtained from the modified device were found to be more reliable, with standard deviations lower than those obtained from other conventional testing devices.