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.

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

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.

КОНСТРУКТИВНО-ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ ХВОСТО-ВИХ БАЛОК СІТЧАСТОГО ТИПУ З ПОЛІМЕРНИХ КОМПО-ЗИЦІЙНИХ МАТЕРІАЛІВ ВЕРТОЛЬОТІВ ТРАНСПОРТНОЇ КАТЕГОРІЇ

2020 ◽  
pp. 15-30
Author(s):  
А. Г. Гребеников ◽  
И. В. Малков ◽  
В. А. Урбанович ◽  
Н. И. Москаленко ◽  
Д. С. Колодийчик
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Layer Structure ◽  
Metal Structure ◽  
Element Model ◽  
Stress Strain ◽  
Element Analysis ◽  
Mesh Structure ◽  
Stress Strain State ◽  
Mesh Structures

The analysis of the design and technological features of the tail boom (ТB) of a helicopter made of polymer composite materials (PCM) is carried out.Three structural and technological concepts are distinguished - semi-monocoque (reinforced metal structure), monocoque (three-layer structure) and mesh-type structure. The high weight and economic efficiency of mesh structures is shown, which allows them to be used in aerospace engineering. The physicomechanical characteristics of the network structures are estimated and their uniqueness is shown. The use of mesh structures can reduce the weight of the product by a factor of two or more.The stress-strain state (SSS) of the proposed tail boom design is determined. The analysis of methods for calculating the characteristics of the total SSS of conical mesh shells is carried out. The design of the tail boom is presented, the design diagram of the tail boom of the transport category rotorcraft is developed. A finite element model was created using the Siemens NX 7.5 system. The calculation of the stress-strain state (SSS) of the HC of the helicopter was carried out on the basis of the developed structural scheme using the Advanced Simulation module of the Siemens NX 7.5 system. The main zones of probable fatigue failure of tail booms are determined. Finite Element Analysis (FEA) provides a theoretical basis for design decisions.Shown is the effect of the type of technological process selected for the production of the tail boom on the strength of the HB structure. The stability of the characteristics of the PCM tail boom largely depends on the extent to which its design is suitable for the use of mechanized and automated production processes.A method for the manufacture of a helicopter tail boom from PCM by the automated winding method is proposed. A variant of computer modeling of the tail boom of a mesh structure made of PCM is shown.The automated winding technology can be recommended for implementation in the design of the composite tail boom of the Mi-2 and Mi-8 helicopters.

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