Effect of Elevated Temperature on Harmonic Interlaminar Shear Stress in Graphite/Epoxy FRP Simply Supported Laminated Thin Plate Using Finite Element Modeling

Alfaqs, Fadi; Haddad, Jamil; Fayyad, Sayel M.; Koroviaka, Yevhenii; Расцвєтаєв, Валерій Олександрович

doi:10.15866/ireme.v14i8.19468

Cited by 8 publications

(8 citation statements)

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“…There is also stratification of the gravel material in size, both in height and in diameter of the formed gravel bedding. Suspension of gravel material on the transporting route with the effect of corking, which requires additional time for its elimination, can be observed accompanied with the risk of formation of gaping cavities opposite the aquifer, which causes well sanding [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Bench studies of the process of transporting an inverse gravel filter of block type along the well

Chudyk,

Sudakova,

Pavlychenko

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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The purpose of the study is to develop a technology for fresh water treatment in deep hydrogeological wells with productive horizons represented by medium-grained, fine-grained, and silty sands by equipping their intake part with block-type inverse gravel filters. Experimental studies were carried out using provisions of the general theory of scientific experiment and the theory of random processes. A theory concerning the possibility of equipping the water intake part of hydrogeological wells, being more than 200 m deep, with block-type inverse gravel filters using the proposed technology was further developed. For the first time, the dependence of the maximum depth of transporting block-type inverse gravel filters on the length of their section, the mass concentration of a binding agent, and the ambient temperature was established. A scope of the proposed technology was substantiated. A range of depths for equipping with block-type inverse gravel filters depending on the mass concentration of a binding agent in the polymer-gravel filter element and the length of its section was substantiated.

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Section: Introductionmentioning

confidence: 99%

Bench studies of the process of transporting an inverse gravel filter of block type along the well

Chudyk,

Sudakova,

Pavlychenko

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…Ivano-Frankivsk National Technical University of Oil and Gas (Ivano-Frankivsk, Ukraine), K. I. Satbaev Kazakh National Research Technical University (Almaty, Kazakhstan), Dnipro University of Technology (Dnipro, Ukraine), and Oles Honchar Dnipro National University (Dnipro, Ukraine) have rich experience and long-standing cooperation in scientific research and development works. Over the past decades, effective designs of tools for drilling medium-and high-hardness rock have been developed [1][2][3][4]; rational layouts of casing and drill strings have been substantiated [5][6][7][8][9][10]; innovative backfill materials have been developed [11,12] along with drilling fluids and technologies for their application [13,14] and gas hydrate production technologies [15].…”

Section: Introductionmentioning

confidence: 99%

A new method of oil and water well completion involving the implosion effect

Chudyk,

Biletskiy,

Ratov

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Features of colmatation zones of a productive formation in terms of rotary drilling by drilling muds are considered. A brief analysis of the most popular decolmatation methods is performed. Special attention is paid to the decolmatation method involving implosion effect. An example of one of the existing installations is represented with following consideration of its application features. A new principally different installation, free from the disadvantages found in the available one, is considered; a patent for the installation is obtained in Kazakhstan. It does not involve tubing with its packer and wellhead sealing. It also does not require a compressor and its manifold. Characteristic features of the newly developed installation for creating implosion effect are represented; its operation at producing both single and any number of repeated implosion acts is examined. A mathematical analysis is performed to calculate the empty space limits required for the implosion effect by a criterion to prevent casing string collapse by hydrostatic pressure of the drilling mud remained in the annular space. An example of dependency of the maximum permitted length of empty space in the casing string on its mechanical strength and its wall thickness, calculated by means of a computer program, is represented.

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“…Therefore, according to the accepted theoretical model (normal law) of the distribution of a random variable, its pa rameters will be erroneously determined: the center of group ing (probable value or mathematical expectation), the vari ance of the deviation, the probable maximum value and the coefficient of nonuniformity of the random freight flow, which is calculated in accordance with the theory of probability and mathematical statistics [30].…”

Section: Introductionmentioning

confidence: 99%

Theoretical model of random freight flow distribution in the conveyor transport line of the coal mine

Lubenets,

Koroviaka,

Snigur

et al. 2023

Nauk. visn. nat. hirn. univ.

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Purpose. Increasing the efficiency of the conveyor transport system of the mine due to the application of rational parameters, which are calculated objectively on the basis of the reliable output data of random freight flow in the conveyor transport line, taking into account the velocity of minerals transportation, including a perfect theoretical model application of the freight flow distribution. Methodology. Complex research: - statistical studies on the actual distribution of random freight flow in the highly productive stages of the PSU Mine “n.a Heroiv Kosmosu” PJSC “DTEK Pavlohradvuhillia”; - description of histograms of the distribution of random freight flow by various indicative algebraic functions, normal and gamma distribution of a random variable and a specially constructed function with separately defined parameters of its branches; - analysis of research results regarding the correctness of the theoretical model of the distribution of random freight flow according to various criteria of genuineness, a center of grouping, amplitude, velocity of rise and fall, and deviation. Findings. A perfect theoretical model was built in the form of an indicative algebraic function, whose branches are described by the normal distribution law of a random variable with separately determined parameters. It describes well the distribution of random freight flow in the conveyor transport line of the mine and ensures the determination of its parameters by the methods of probability theory. Originality. A theoretical model of the distribution of random freight flow in the conveyor transport line of the mine has been obtained for the first time, which describes well various cases of its distribution, including symmetric and asymmetric ones, and provides the determination of the freight flow parameters by the methods of probability theory. Practical value. The actual value of the coefficient of nonuniformity of the freight flow in the conveyor transport line of the mine, which was determined by a perfect theoretical model, exceeds, by almost a quarter, the value inherent in the model accepted in practice, the normal law of the distribution of a random variable. The coefficient of nonuniformity of the freight flow in the highly productive longwalls of only the specified mine reaches a value of 2.012, which already exceeds the normative value limit for conveyor transport lines along horizontal and inclined preparatory workings of mining areas (2.0). Reliable initial data on the variation of the random freight flow in the conveyor transport line of the mine, which is substantiated by a perfect theoretical model of its distribution, have a positive effect on the calculation of its parameters and contribute to increasing the efficiency and reliability of the functioning of the conveyor transport system.

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Effect of Elevated Temperature on Harmonic Interlaminar Shear Stress in Graphite/Epoxy FRP Simply Supported Laminated Thin Plate Using Finite Element Modeling

Cited by 8 publications

References 0 publications

Bench studies of the process of transporting an inverse gravel filter of block type along the well

Bench studies of the process of transporting an inverse gravel filter of block type along the well

A new method of oil and water well completion involving the implosion effect

Theoretical model of random freight flow distribution in the conveyor transport line of the coal mine

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