Deteriorated Heat Transfer Influence On the Stress-Strain State of SMR SCWR Fuel Bundles

2021 ◽  
Author(s):  
Yaroslav Dubyk ◽  
Vladislav Filonov ◽  
Yuliia Filonova ◽  
Olexander Kovalenko
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Strain State ◽  
Numerical Data ◽  
Maximum Temperature ◽  
Strength Analysis ◽  
Stress Strain ◽  
Stress Strain State ◽  
Experimental Profile ◽  
Axial Profile

Abstract The analysis of deteriorated heat transfer (DHT) influence on the stress-strain state of a perspective core of Small Modular Reactors with Supercritical Water (SMR SCWR) fuel assemblies is carried out, based on experimental and numerical data. Experimental data for 3- and 7-rod assemblies of 600 mm height with twisting spacer screws, on which deterioration heat transfer regimes were observed. The analysis of the stress-strain state was performed for two cases of temperature field. In the first variant, the temperature field is estimated using Computational Fluid Dynamics (CFD) with low-Re effects accounting, which allows obtaining the maximum temperature, but incorrectly estimates the axial profile. In the second case, an experimental profile with an averaged tangential temperature value is considered. Strength analysis is performed using the developed numerical-analytical mechanical model of the rod assembly. Obtained results make it possible to establish what is more important for assessing the safety of perspective reactors: a conservative estimate of the maximum wall temperature or its local distribution.

Estimating the Stress-Strain State of Roll by Temperature Gradient in the Course of its Heat Treatment

2021 ◽  
Vol 316 ◽  
pp. 967-972
Author(s):  
Alexander S. Savinov ◽  
Sergey M. Andreev ◽  
Nikolay A. Feoktistov
Keyword(s):  
Heat Treatment ◽  
Temperature Gradient ◽  
Strain State ◽  
Thermal State ◽  
Maximum Temperature ◽  
Cast Billet ◽  
Treatment Schedule ◽  
Stress Strain ◽  
Metallurgical Enterprise ◽  
Stress Strain State

The paper considers the issue of mathematical simulating the stress-strain state of a roll in the course of its heat treatment. It is shown that a sound heat treatment schedule affects significantly the economic efficiency of a metallurgical enterprise. The mathematical apparatus is provided to estimate the thermal interaction in the casting-furnace system, based on which a program for calculating the thermal state of a roll during heat treatment has been developed. Using this program allows evaluating the thermal stresses occurring in a roll during the heat treatment cycle and reducing the risk of discontinuity in the roll cast billet. Also, using the program developed, allows significant reducing the engineer-technologist man-hours for the design of the process cycle of the casting heat treatment. An example of calculating the thermal state of a roll with a diameter of 930 mm in casting is given. The change in the dynamics of the maximum temperature gradient along the product radius is shown, while correlating it with the furnace setting.

Simulating the stress–strain state of a thin plate after a thermal shock

2021 ◽  
Author(s):  
A. V. Sedelnikov ◽  
S. V. Glushkov ◽  
V. V. Serdakova ◽  
M. A. Evtushenko ◽  
E. S. Khnyryova
Keyword(s):  
Temperature Field ◽  
Thermal Shock ◽  
Thin Plate ◽  
Strain State ◽  
Stress Strain ◽  
Homogeneous Plate ◽  
Stress Strain State ◽  
The Impact ◽  
Elastic Elements

The paper is devoted to simulating the impact of a thermal shock on a thin homogeneous plate in the ANSYS package. The assessment of the stress–strain state is carried out and the dynamics of changes in the temperature field of the plate is determined. The obtained results were compared with the data of other authors and can be used when taking into account the thermal shock of large elastic elements of spacecraft.

EFFECT OF HEAT TRANSFER ON THE STRESS-STRAIN STATE OF THE MATERIAL CONSIDERING THE FINAL HEAT PROPAGATION VELOCITY

2021 ◽  
Author(s):  
N. E. Proskuriakov ◽  
◽  
I. V. Lopa ◽  
Keyword(s):  
Heat Transfer ◽  
Propagation Velocity ◽  
Strain State ◽  
Heat Propagation ◽  
Stress Strain ◽  
Final Heat ◽  
Stress Strain State

Анализируются результаты расчетов различных волновых задач. Показано, что деформационный нагрев материала интенсивен вблизи граничной поверхности и быстро уменьшается при незначительном удалении от нее. Делается вывод, что для получения точных решений волновых задач в неизотермической постановке необходимо учитывать перераспределение температуры в материалах из-за теплопередачи и его влияние на напряженно-деформированное состояние материалов различных конструкций. Приводятся результаты расчетов. Отмечена чувствительность решения к изменению удельной теплоемкости и коэффициента температуропроводности, входящих в волновое уравнение теплопроводности.

Evaluation of strength of carrying metal structures of trailers

2020 ◽  
Vol 2 (100) ◽  
pp. 58-69
Author(s):  
P. Popovych ◽  
L. Poberezhny ◽  
O. Shevchuk ◽  
I. Murovanyi ◽  
T. Dovbush ◽  
...  
Keyword(s):  
External Load ◽  
Strain State ◽  
Deformation Energy ◽  
Strength Analysis ◽  
Preliminary Assessment ◽  
Stress Strain ◽  
Load Bearing ◽  
Metal Structures ◽  
Stress Strain State ◽  
Increased Risk

Purpose: Development of a computational model of stress-strain state bearing elements of trailer frames for preliminary assessment and identification of areas with increased risk of failure. Design/methodology/approach: The object of the study is the processes of loading the load-bearing metal structures of trailers - fertilizer spreaders. The stress-strain state of the spreader bearing system is investigated for the established three typical cases of external load. To refine the values obtained as a result of modelling, they were determined in SOLIDWORKS. Findings: Computational models of load have been compiled by improving the method of minimum potential deformation energy for its effective correct use in analytical studies of a similar type of metal structures. It is proved that for a flat closed frame structure made of thin-walled profiles, loaded with forces perpendicular to the plane of the frame, the levelling of compression and shear energies, as well as axial and transverse forces and bending moments in the horizontal plane does not significantly affect the calculation results. Research limitations/implications: Horizontal components of the shear forces as well as the normal forces and as a consequence the corresponding potential deformation energy are neglected, which has some effect on the accuracy of the calculations. Practical implications: An effective tool for strength analysis with preliminary assessment and diagnostics of load-bearing metal structures based on the constructed calculation models of stress strain state load-bearing frames of typical geometry with an arbitrarily given distribution of external load. Originality/value: A universal algorithm for recording additive functions of bending and torques, as well as the potential deformation energy of welded frames of trailers.

scholarly journals Specific features of thermal deforming of composite inductors during magnetic-pulse processing of materials

2021 ◽  
pp. 127-130
Author(s):  
Galina Ottovna Anishchenko ◽  
Vladimir Ivanovich Konokhov ◽  
Denis Vladimirovich Lavinsky
Keyword(s):  
Electromagnetic Field ◽  
Temperature Field ◽  
Strain State ◽  
Nonlinear Effects ◽  
Magnetic Pulse ◽  
The Finite Element Method ◽  
Stress Strain ◽  
Pulse Processing ◽  
Stress Strain State ◽  
Field Temperature

The problem of taking into account a non-stationary inhomogeneous temperature field in the analysis of the stress-strain state of inductor systems for magnetic-pulse processing of materials is considered. It follows from the analysis of open information sources that the problem of analyzing a non-stationary temperature field arising from the presence of a non-uniform electromagnetic field and its effect on deformation has been sufficiently studied in relation to induction heating. At the same time, during other operations of magnetic-pulse processing of materials, heating of equipment can cause additional deformations of a significant magnitude, which, in turn, can lead to a loss of equipment performance due to destruction or irreversible deformation. A general approach to the analysis of such problems is proposed, which involves the determination of the spatial-temporal distributions of the quantitative characteristics of the electromagnetic field, temperature field and stress-strain state. The necessity of using numerical methods for carrying out such an analysis has been substantiated. The most effective numerical method is the finite element method, which makes it possible to analyze the unsteady electromagnetic field, temperature field, and stress-strain state within the same calculation scheme. In this case, within the framework of the finite element method, iterative schemes can be created that allow taking into account nonlinear effects. Here, nonlinear effects can be due to the dependence of the mechanical and electro-physical properties of the material on temperature, the plastic nature of deformation, and the need to take into account contact phenomena. The results of complex analysis for a composite single-turn inductor with a dielectric band are presented. The features of contact interaction were taken into account by introducing layers of contact finite elements. The stress-strain state of the inductor is estimated for two variants of the materials used: copper and non-magnetic steel.    

scholarly journals The study of heat transfer and stress-strain state of a material, taking into account its fractal structure

2020 ◽  
Vol 7 (2) ◽  
pp. 400-409
Author(s):  
Ya. I. Sokolovskyy ◽  
◽  
M. V. Levkovych ◽  
I. Ya. Sokolovskyy ◽  
◽  
...  
Keyword(s):  
Heat Transfer ◽  
Strain State ◽  
Fractal Structure ◽  
Stress Strain ◽  
Stress Strain State
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