Mathematical modeling of the stress-strain state of flexible threads with regard to plastic deformations

Коновалов, Владимир; Zaĭtsev, V. K.; Rodionov, Yu. V.

doi:10.1088/1742-6596/1084/1/012008

Cited by 15 publications

(6 citation statements)

References 7 publications

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“…Тем самым подтверждается тот факт, что изделие, состоящее из отдельных железобетонных блоков соединенных между собой, ведет себя под внешним воздействием как цепь или изгибно-жесткая нить. Поскольку в силу особенностей работы таких элементов при действии поперечной нагрузки вектор, соответствующий внутреннему усилию, всегда направлен по касательной к его оси [16,17].…”

Section: рисунок 3 -зависимость продольной реакции в связи по времени от коэффициента трения скольженияunclassified

Analysis of the Dynamic Behavior of a Mobile Barrier Based on a Mechanical Chain Model

Bolshakov¹,

Volkov²,

Aksenova³

2021

XCROTPACOTPP

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Аннотация. Объектом исследования выступало мобильное заграждение, образованное железобетонными блоками соединенными между собой и предназначенное для создания физического препятствия для автотранспортного средства. Предметом исследования настоящей работы являлись внутренние усилия в элементах связей мобильного заграждения, возникающие в результате действия кратковременной динамической нагрузки, а также деформации заграждения, характеризующиеся углом поворота ударяемого блока вокруг его продольной оси. Исследование проведено с помощью коммерческой системы компьютерного моделирования SolidWorks «Анализ движения». Расчет связанных дифференциальных и алгебраических уравнений, определяющих движение модели механической цепи при наезде автотранспортного средства, производился с помощью интегратора переменного порядка и шага WSTIFF. Проведен анализ по влиянию коэффициента трения скольжения на характер изменения реакций, возникающих в элементах связей между отдельными блоками, а также на поведение конструкции. Выявлена значительная обусловленность возникающих внутренних усилий в элементах связей, а также углов поворота блоков вокруг продольной оси заграждения от указанного параметра. Полученные данные дают возможность принимать эффективные технические решения по снижению коэффициента трения скольжения в паре «мобильное заграждение -основание для его установки» при разработке и применении подобных устройств.Ключевые слова: цепь, изгибно-жесткая нить, мобильное заграждение, удар, коэффициент трения.

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Section: рисунок 3 -зависимость продольной реакции в связи по времени от коэффициента трения скольженияunclassified

Analysis of the Dynamic Behavior of a Mobile Barrier Based on a Mechanical Chain Model

Bolshakov¹,

Volkov²,

Aksenova³

2021

XCROTPACOTPP

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“…The technical result of the study lies in the efficiency of dehydration by increasing the contact area (Ryzhakov, Kholudeneva & Ryzhakov, 2014;Tarasov, Konovalov, Zaitsev & Rodionov, 2018;Zaitsev, Konovalov, Gumarov & Rodionov, 2018). The research problem has been solved.…”

Section: Introductionmentioning

confidence: 99%

Operating parameters of an energy-efficient electroosmotic device for dehydrating wastewater sludge from paper production

Kholudeneva

Efremova

Коновалов³

2022

Nexo Revista Científica

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The paper describes the design of an electroosmotic device for treating dehydration of water-mineral-organic wastewater sludge from paper production and a methodology for conducting experimental studies. As for regression equations for the reduction factor of the waste mass, specific indicators were presented: drainage fluid consumption, current strength, power consumption, and energy, depending on the voltage on the electrodes and the duration of treatment. Besides, the required waste treatment function depends on the voltage and the required waste concentration. Equations and graphs were presented. In terms of the intensity of fluid excretion, it was found that the most effective treatment is performed during the first 0.5–0.7 h. At a voltage of about 25 V, the processing time of waste (until the mass of waste is reduced to 1/3) is about 0.75 h, and at a voltage of less than 10 V, it is about 3–5 h. With a decrease in the voltage, the liquid withdrawal slows down faster. By the magnitude of the current, the separation process lasts for the first 0.7–1.0 h. By the nature of the change in the current, the process is homogeneous (differing only in intensity) at a voltage of more than 8 V. At a lower voltage, the intensity of waste separation by current strength and an increase in the duration of processing decreases sharply. The power consumption is actively growing in the first 1–2 h of processing, gradually slowing down. Then we found the proportionality of power to the applied voltage. The increase in power was associated with a decrease in the distance between the electrodes. With a decrease in the mass of waste less than 50% of the initial value, energy is less efficiently used for separating waste, and the observed increase in energy consumption during further processing sharply increases energy consumption. To reduce the final mass of waste and obtain their concentrate, it was necessary to increase energy consumption. Waste processing should be stopped when 1/3 of the initial waste mass remains due to the actual cessation of the separation of waste fractions with an active increase in energy consumption.

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“…In the event of cyclic variation thereof, the parameters of the non-elastic strain process limit the service life of the structure. If the residual strains resulting from plastic flow at the beginning of loading no longer accumulate after a certain number of cycles, this means that the structure has adapted to the loads [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Durability of Threaded Joints

et al. 2021

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The article deals with the determination of the resistance to cyclic loading of the threaded joints of pressure vessels and defective elements according to the failure mechanics criteria. Theoretical and experimental studies do not provide a sufficient basis for the existing calculation methods for the cyclic strength of the threaded joints of pressure vessels. The short crack kinetics in the threaded joints, a shakedown in one of the joint elements of pressure vessels, i.e., in the bolt or stud, has not been studied sufficiently. The calculation methods designed and improved within the study were based on theoretical and experimental investigations and were simplified for convenient application to engineering practice. The findings could be used to investigate the shakedown of studs of a different cross-section with an initiating and propagating crack. Value: the developed model for the assessment of durability of the threaded joints covers the patterns of resistance to cyclic failure (limit states: crack initiation, propagation, final failure) and shakedown (limit states: progressive shape change and plastic failure). Analysis-based solutions of plastic failure conditions and progressive shape change were accurate (the result was reached using a two-sided approach; the solutions were obtained in view of the parameters of the cyclic failure process in the stud (bolt) and based on experimental investigations of the threaded joints).

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Mathematical modeling of the stress-strain state of flexible threads with regard to plastic deformations

Cited by 15 publications

References 7 publications

Analysis of the Dynamic Behavior of a Mobile Barrier Based on a Mechanical Chain Model

Analysis of the Dynamic Behavior of a Mobile Barrier Based on a Mechanical Chain Model

Operating parameters of an energy-efficient electroosmotic device for dehydrating wastewater sludge from paper production

Assessment of the Durability of Threaded Joints

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