Method of parametric optimization in the problems of passenger airliner design

2020 ◽  
Author(s):  
A.A. Bolshikh ◽  
V.P. Eremin
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Parametric Optimization ◽  
Polymer Composite Materials ◽  
Preliminary Design ◽  
Structural Elements ◽  
The Finite Element Method ◽  
Current Trends ◽  
Box Structure ◽  
Mass Perfection

The paper describes current trends in the design of load-bearing structural elements of modern airliners made using polymer composite materials. In modern passenger airliners, polymer composite materials are used to ensure mass perfection of both lightly loaded elements and critical units, including wing and fin boxes. By means of the finite element method, a box model was created using shell finite elements. Parametric optimization was carried out with account for the anisotropic properties of structural materials. The purpose of the work is to develop a methodology for calculating the structural strength elements of the box and justify the required thicknesses with restrictions on compressive / tensile deformations and loss of stability. The developed methodology makes it possible to obtain a box structure with a minimum mass, while maintaining the necessary stiffness and strength characteristics at the stage of preliminary design.

IMPACT OF HIGH VOLTAGE ELECTRIC DISCHARGES ON THE CURED POLYMER COMPOSITE MATERIALS, MODIFIED IN A MICROWAVE ELECTROMAGNETIC FIELD

2020 ◽  
pp. 6-12
Author(s):  
I. V. Zlobina ◽  
A. A. Korotich
Keyword(s):  
Electromagnetic Field ◽  
Surface Layer ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Minimum Wage ◽  
Polymer Composite ◽  
High Voltage ◽  
Polymer Composite Materials ◽  
Structural Elements ◽  
The Impact

Due to the widespread use of carbon fiber-reinforced polymer composite materials (PCM) in the structural elements of aircraft with a distributed surface layer of lightning-proof coating (MFP) in the form of metal grids to reduce the risk of lightning strikes and the possibility of increasing their strength characteristics by processing in the microwave electromagnetic field, the need to study the impact of this method of processing on the resistance of PCM to high voltage electrical discharges. The studies of the impact of the discharge voltage 180…200 kV on samples of PCM with the minimum wage and no minimum wage. It is established that pretreatment of samples of the cured polymer composite MW in a microwave electromagnetic field energy flux density (17…18)104 µw/cm2 does not degrade their molniezaschita characteristics and contributes to reducing the size of the damaged area up to 1.5 times. Samples processed in the microwave electromagnetic field without MSP do not have delaminations and burns in contrast to the control ones. The obtained results indicate the possibility of strengthening treatment in the microwave electromagnetic field of structural elements of carbon fiber distributed in the surface layer of the MSP in the form of a metal grid.

scholarly journals Energy-saving technology of production of elements of building structures from polymer materials

2021 ◽  
pp. 41-48
Author(s):  
A.V. Kondratiev ◽  
О.О. Prontsevych
Keyword(s):  
Composite Materials ◽  
Energy Saving ◽  
Polymer Composite ◽  
Technological Process ◽  
Polymer Materials ◽  
Polymer Composite Materials ◽  
Gas Evolution ◽  
Curing Process ◽  
Structural Elements ◽  
Energy Saving Technology

Problem statement. At present, the increase in the efficiency of the technology for the production of composite structural elements is associated with high energy costs. In this regard, the implementation of ways to optimize the parameters of the technological process of manufacturing polymer composite materials is of great importance. The purpose of the article is to optimize the modes of impregnation and curing of thermosetting binders and polymer composite materials based on them in combination with the kinetics of gas evolution and control of all stages of the technological process. Results. An energy-saving technology for molding composite structural elements of buildings and structures has been developed, which provides a reduction in the duration of the curing process of polymer materials, depending on the type of binder. The technology makes it possible to control the speed and degree of curing of a thermosetting binder by changing the tangent of the dielectric loss angle and electrical conductivity. Scientific novelty and practical significance. The approach and the electrophysical method for optimizing the modes of impregnation and curing of composite products in combination with the control of all stages of the technological process have been further developed in relation to the elements of composite structures. The permissible values of the curing parameters have been established according to the optimized mode of a number of thermosetting binders: heating rates, isotherm temperatures, and holding time at them. At the same time, the achieved optimal curing times for binders BFOS, LBS-4, ENFB, 5-211B using the new technology is 2.4; 1.8; 3.0; 2.3; 2.0 and 1.2 times less than according to known technologies. The results obtained guarantee the quality of the resulting composite product and are recommended for accelerating the curing process of polymer materials. Keywords: optimization; technological regime; impregnation; curing; thermosetting binders; gas evolution; stage control

Designing of ship shafts made of polymer composite materials

2021 ◽  
pp. 38-44
Author(s):  
В.А. Коршунов ◽  
Р.С. Мудрик ◽  
Д.А. Пономарев ◽  
А.А. Родионов
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Polymer Composite Materials ◽  
Torsional Stiffness ◽  
Design Parameters ◽  
Main Body ◽  
Design Calculation ◽  
The Finite Element Method ◽  
Design Calculations ◽  
Design Options

В работе предложены процедуры для выполнения проектировочного расчета судовых валов из полимерных композиционных материалов. Рассматривалась цилиндрическая оболочка, являющаяся основным телом промежуточного судового вала. Она сформирована из пакетов монослоев, состоящих из армирующего волокна и связующей матрицы. Определяющей нагрузкой на судовой вал принят крутящий момент. Заданы ограничения на параметры напряженно-деформированного состояния, характеризующие формы отказов для оболочки в целом и пакета монослоев. Получены аналитические зависимости, связывающие параметры проектирования с крутильной жесткостью, касательными напряжениями потери устойчивости оболочки и нормальными напряжения в волокне. При заданных характеристиках материала проектирование сведено к определению радиуса и толщины оболочки вала. Выполнена серия проектировочных расчетов, различающихся типом активных ограничений. Полученные варианты проектирования проанализированы с помощью метода конечных элементов. Произведена проверка удовлетворения всех ограничений. Предложены условия проектирования, обеспечивающие приемлемые варианты проектов валов из ПКМ. The paper proposes procedures for performing the design calculation of ship shafts made of polymer composite materials. The cylindrical shell, which is the main body of the intermediate ship shaft, was considered. It is formed from packages of monolayers consisting of a reinforcing fiber and a binding matrix. The determining load on the ship's shaft is assumed to be the torque. Restrictions are set on the parameters of the stress-strain state that characterize the failure forms for the shell as a whole and the monolayer package. Analytical dependences linking the design parameters with torsional stiffness, tangential stresses of the shell loss of stability and normal stresses in the fiber are obtained. With the specified material characteristics, the design is reduced to determining the radius and thickness of the shaft shell. A series of design calculations, differing in the type of active constraints, has been performed. The obtained design options are analyzed using the finite element method. The check of satisfaction of all restrictions is made. The design conditions that provide acceptable variants of shaft designs from PCM are proposed.

Probabilistic Modeling of Adhesive-Latent Interaction of Structural Elements of Composite Materials

2020 ◽  
Vol 25 (1) ◽  
pp. 76-81
Author(s):  
A.A. Barzov ◽  
◽  
V.M. Korneeva ◽  
S.S. Korneev ◽  
A.V. Cherednichenko ◽  
...  
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Probabilistic Model ◽  
Block Diagram ◽  
Polymer Composite Materials ◽  
Structural Elements ◽  
Adhesive Bonds ◽  
Kinetics Of ◽  
Adhesion Factor

A block diagram of the interaction of the main elements of polymer composite materials and a probabilistic model of their functioning are proposed. The double role of the adhesion factor of polymer composite materials is shown and the possibility of its optimization is established. The kinetics of fracture of polymer composite materials is analyzed taking into account the strength of adhesive bonds and prospects for further research are outlined.

MODERN MATERIALS FOR THE AIRCRAFT CABIN

2021 ◽  
pp. 33-42
Author(s):  
E.A. Veshkin ◽  
◽  
R.A. Satdinov ◽  
A.A. Barannikov ◽  
◽  
...  
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Air Conditioning ◽  
Polymer Composite Materials ◽  
Structural Elements ◽  
Aircraft Cabin ◽  
Air Conditioning Systems ◽  
Passenger Aircraft

The paper considers the latest technologies and polymer composite materials developed at FSUE «VIAM» and used in the manufacture of structural elements of a passenger aircraft cabin (namely: air conditioning systems, three-layer interior and floor panels) that meet the requirements of the Aviation Regulations AP-25 (Appendix F, Part I ), as well as the requirements for mechanical and mass characteristics. The developed products are made entirely from domestic components, which in turn reduces dependence on imported materials.

FEATURES OF THE USEAGE OF SOFTWARE FOR STRUCTURAL ANALYSIS CONSTRUCTION FROM POLYMER COMPOSITE MATERIALS (Review)

2021 ◽  
pp. 10-18
Author(s):  
V. A. Goncharov ◽  
P. N. Timoshkov ◽  
M. N. Usacheva
Keyword(s):  
Finite Element Method ◽  
Mass Transfer ◽  
Finite Element ◽  
Composite Materials ◽  
Structural Analysis ◽  
Polymer Composite ◽  
Static Strength ◽  
Polymer Composite Materials ◽  
The Finite Element Method ◽  
Materials Used

This review considers the popular software for the calculation and technical means of structures made of polymer composite materials, used by specialists from design bureaus and research centers. These programs analyze the dynamics and static strength of heat and mass transfer, solve problems of mechanics, structural analysis and related multidisciplinary problems. The most commonly used levels of destruction of PCM, Hill-Mises, Tsai-Wu, Hoffman correspond. The finite element method is considered as one of the most effective in calculating aircraft structures.

scholarly journals Modeling the behavior of pedestrian railings taking into account their joint work with the span of bridges

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Vitaliy Koptilov ◽  
Vasiliy Lebedev ◽  
Boris Mandrik – Kotov ◽  
Ilya Ovchinnikov
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Composite Materials ◽  
Polymer Composite ◽  
Static Loading ◽  
Strain State ◽  
Polymer Composite Materials ◽  
The Finite Element Method ◽  
Joint Work ◽  
Bridge Structures

The problem of calculating pedestrian railing made of polymer composite materials on bridge structures is analyzed. It is noted that, although methods for calculating various products and structures made of polymer composite materials have been sufficiently developed, however, methods for calculating pedestrian railing are still just beginning to be developed. Normative methods for calculating pedestrian railing are very primitive and do not take into account all the features of their work. The article discusses the application of the finite element method to the calculation of pedestrian railing, and in addition to standard loads, the effect of the wind load and the joint work of the pedestrian railing with the span are taken into account. It is shown that the joint work of the pedestrian railing with the span, even under static loading, has a significant effect on its stress-strain state, increasing it, which in certain cases, in the presence of installation defects, leads to the destruction of the pedestrian railing from polymer composite materials.

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