scholarly journals Influence of Internal Defects of Basic Metal of the Equipment on Its Operational Properties

2022 ◽  
Author(s):  
S.I. Valeev

Abstract. The paper deals with the issue of safe operation of technological equipment with a defect in the base metal of the delamination type. Mathematical modeling of the stress-strain state in the defect zone by the finite element method in ANSYS software package is carried out. The article presents and analyzes the obtained graphs of the distribution of stress intensity factors. Based on the analysis of the obtained dependences, it is shown that stratification of the base metal does not have a significant effect on the performance of the process equipment.

2021 ◽  
Author(s):  
Илья Евгеньевич Харламов ◽  
Сергей Ильдусович Валеев

Методом конечных элементов с помощью программного комплекса ANSYS проведен анализ влияния дефекта основного металла типа «расслоение», в зависимости от глубины его залегания, на возможную безопасную эксплуатацию технологического оборудования. По результатам исследований установлено, что расслоение не оказывает существенного влияния на несущую способность оборудования, пока оно локально и не распространяется. The analysis of the influence of a base metal defect of the "stratification" type, depending on the depth of its occurrence, on the possible safe operation of technological equipment was carried out by the finite element method using the ANSYS software package. According to the results of the research, it was found that the stratification does not significantly affect the load-bearing capacity of the equipment, as long as it is local and does not spread.


2020 ◽  
Vol 164 ◽  
pp. 02003
Author(s):  
Viacheslav Chepurnenko ◽  
Batyr Yazyev ◽  
Ludmila Dubovitskaya

The article presents solutions to the problem of rod buckling, taking into account creep effects. Trigonometric series, the finite difference method in combination with the programming language MATLAB, as well as the finite element method in the ANSYS software package were used in the solutions. The behavior of the rods is researched for two types of relations between strain and stress during creep, with strains in an explicit and implicit form. When solving, the criterion of initial imperfections with their different values is used, as well as the tangential-modular theory. The results obtained for the two creep models are compared. The conclusion is made about the accuracy of the results of calculations in ANSYS with the presence of a combination of geometric and physical nonlinearity for various creep models.


2020 ◽  
Vol 13 (2) ◽  
pp. 4-11
Author(s):  
Natal'ya Grebennikova ◽  
Pavel Kuprienko ◽  
S. Nikolenko ◽  
Svetlana Sazonova

In carrying out research on the technical condition of brick buildings, there is a need to study the strength of load-bearing walls. The paper presents the results of determining the strength of silicate brick by a non-destructive diagnostic method, using the ONIX-2.6 shock impulse control device of bricks. Calculation results are presented to determine the cause of cracking in brick walls. Verification calculations of building constructions were performed by the finite element method using the NormFEM application of the licensed version of the NormCAD software package.


2021 ◽  
Vol 258 ◽  
pp. 09085
Author(s):  
Nurilla Noraliev ◽  
Bakhrom Ishniyazov ◽  
Bunyod Safarov ◽  
Oybek Saparov

This article presents the results of a numerical study of the stress concentration around two equal and unequal holes in an orthotropic spherical shell made of composite materials under the action of internal pressure. The influence of geometric (hole radii, shell thickness, distance between holes) characteristics, as well as material orthotropy and shear stiffness, on the stress state of spherical shells made of composite materials is studied. A numerical algorithm based on the finite element method has been developed and a software package has been implemented on a computer that allows solving the problem of stress concentration near two unequal holes in spherical shells made of composite materials.


2020 ◽  
Vol 157 ◽  
pp. 06014
Author(s):  
Sergey Chizhov ◽  
Artyom Pismak ◽  
Anatoly Antonyuk

The objects of the article are: analyze the work of the main beams of the movable span of the drop-down system near the axis of rotation; analyze the stress-strain state of the main beams of the movable span of the drop-down system near the axis of rotation; analyze the acceptability of the normative methodology (SP) for calculating the stability of the wall of a continuous steel beam during the design and calculation of movable bridge of the drop-down system. A computational-mathematical model of the movable span of the drop-down system is developed in a modern computational software package based on the finite element method. The main disadvantages of the normative methodology (SP) for calculating the wall stability of a continuous steel beam which used in design and calculation of movable bridge of a drop-down system are presented.


Author(s):  
Ксения Валерьевна Кожаева ◽  
Эльвина Айратовна Акчурина

Совершенствование технологий строительства подземных трубопроводов в условиях многолетнемерзлых грунтов, предусматривающее минимизацию теплового воздействия трубопровода на грунт во время эксплуатации, является актуальной научно-технической задачей. Авторами разработан способ прокладки подземного трубопровода, снижающий до минимума его тепловое воздействие на вмещающий мерзлый грунт и позволяющий в процессе дальнейшей эксплуатации поддерживать температуру перекачиваемой нефти без дополнительного подогрева. Конструктивной схемой предусмотрена укладка трубопровода в изолированную траншею с использованием торфа в качестве грунта-изоляции. В рамках исследования разработана модель прокладки трубопровода (в программном комплексе SolidWorks), произведены расчеты его напряженно-деформированного состояния (в программном комплексе ANSYS) и теплового воздействия на мерзлый грунт (в программном комплексе FROST 3D Universal). Установлено, что напряжения и перемещения, возникающие во время эксплуатации трубопровода, уложенного по предложенной конструктивной схеме, находятся в диапазоне допустимых значений, а его тепловое воздействие вызывает незначительное протаивание грунта и минимальные изменения температуры перекачки нефти. The improvement of technologies of underground pipeline construction in conditions of permafrost soils, providing for the minimization of the thermal effect of the pipeline on the soil during operation is an urgent scientific and technical task. The authors have developed a method for laying an underground pipeline that minimizes its thermal effect on the enclosing frozen soil and allows maintaining the temperature of the pumped oil during further operation without additional heating. The structural layout provides for laying the pipeline in an isolated trench using peat as insulation soil. As part of the study, a pipeline-laying model was developed (using the SolidWorks software package), calculations of its stress-strain state (in the ANSYS software package) and thermal effect on frozen soil (in the FROST 3D Universal software package) were performed. It has been determined that the stresses and displacements arising during the operation of the pipeline laid in accordance with the proposed structural layout are in the range of allowable values, and its thermal effect causes insignificant soil thawing and minimal changes in the oil pumping temperature.


2021 ◽  
Vol 227 ◽  
pp. 04002
Author(s):  
Dilbarkhon Sh. Fazilova ◽  
Lola V. Sichugova

This paper presents the results of the GNSS geodetic network deformation analysis in the Tashkent region, as an example of an urban area, where obtaining reliable information for assessing hazard risk is of great importance. A software package in Delphi language has been developed for the assessment of the datum differences between 2009 and 2011 by implementing the 3D Helmert transformation method. The result revealed that there is significant translation and rotation in the network, while the scale of the network remains almost constant during two years period. The area strain was estimated by the finite element method. Most of the Tashkent region can be considered to be in a high compression (negative dilatation) strain state with maximum value -230cl0-8. On the contrary, remarkable positive dilatation strain is concentrated on the coastline of the Charvak water reservoir, where large strain is about 351.l0-8.


Author(s):  
Peter Gaydzhurov ◽  
Elvira Iskhakova ◽  
Nadezhda Tsaritova

For regular hinge-rod structures, an engineering method for analyzing the stress-strain state is devel­oped, taking into account the transformation of the form by folding repeated fragments of the structure. For the software implementation of the proposed calculation algorithm, a macro is compiled in the APDL language, which is built into the ANSYS software package. A step-by-step procedure that simulates the transformation of the farm geometry was tested.


2014 ◽  
Vol 721 ◽  
pp. 131-134
Author(s):  
Mi Mi Xia ◽  
Yong Gang Li

To research the load upper bracket of Francis hydroelectric unit, then established the finite-element model, and analyzed the structure stress of 7 operating condition points with the ANSYS software. By the strain rosette test, acquired the data of stress-strain in the area of stress concentration of the upper bracket. The inaccuracy was considered below 5% by analyzing the contradistinction between the finite-element analysis and the test, and match the engineering precision and the test was reliable. The finite-element method could be used to judge the stress of the upper bracket, and it could provide reference for the Structural optimization and improvement too.


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