INVESTIGATION OF CORROSION WEAR OF SUPPORTING METAL STRUCTURES OF FREIGHT CARS DURING MEASURES TO EXTEND THE TERM OF SERVICE

2020 ◽  
pp. 43-53
Author(s):  
D. Bulich ◽  
S. Sapronova ◽  
V. Tkachenko ◽  
A. Koshel
Keyword(s):  
Statistical Analysis ◽  
Residual Life ◽  
Corrosion Wear ◽  
Load Bearing ◽  
Metal Structures ◽  
Individual Approach ◽  
Freight Car

All elements of load-bearing metal structures of freight cars are subject to corrosion wear. In this article, a statistical analysis of corrosion wear for each element of load-bearing metal structures. Damage to load-bearing metal structures of gondola cars taking into account corrosion wear is considered. Measures to increase the possible maximum corrosion wear, which can be used to predict the residual life and structural finishing of the elements of load-bearing metal structures. Cracks and fractures that are not detected in time, which turn into through-corrosion during operation, have a great impact on corrosion. To determine the corrosion of the freight car requires an individual approach to each element of the load-bearing structures of the car, taking into account the performance and time of repair.Studies have shown that half of freight cars were operated with corrosion of some elements of load-bearing metal structures more than 30%. This shows the possibility of increasing the tolerance of the threshold of corrosion wear of cars, which will affect the ability to reduce the exclusion of freight cars from the inventory.

STUDY OF RESIDUAL RESOURCE AND ESTABLISHMENT OF THE LIMIT LIFE OF NON-PURCHASER PASSENGER CARS OF CONSTRUCTION OF KVZ

2020 ◽  
pp. 54-62
Author(s):  
N. Radkevich ◽  
S. Sapronova ◽  
V. Tkachenko
Keyword(s):  
Service Life ◽  
Residual Life ◽  
Rolling Stock ◽  
Technical Diagnostics ◽  
Passenger Cars ◽  
Load Bearing ◽  
Metal Structures ◽  
Passenger Traffic ◽  
Long Operation ◽  
Theoretical Results

In order to ensure the uninterrupted performance of passenger traffic, the task of ensuring the operation of rolling stock outside the extended service life, including passenger cars for the carriage of passengers, remains relevant. Based on this, there is a need for comprehensive research aimed at substantiating the possibility of ensuring operation while maintaining dynamic and strength characteristics. The article examines the residual life of load-bearing metal structures of passenger cars based on the results of technical diagnostics and standard tests. It is concluded that the condition of the load-bearing metal structures of passenger cars built by the Kryukiv Carriage Plant (KСP) after long operation does not approach the limit. The obtained practical and theoretical results make it possible to extend the service life of passenger cars for the construction of KCP beyond the factory set by 41 years.

scholarly journals INVESTIGATION OF RESIDUAL RESOURCE OF SPECIAL RAILWAY VAGON

2021 ◽  
Vol 1 (37) ◽  
pp. 50-58
Author(s):  
N. Radkevich
Keyword(s):  
Service Life ◽  
Residual Life ◽  
Technical Diagnostics ◽  
Residual Service Life ◽  
Passenger Cars ◽  
Scientific Publications ◽  
Load Bearing ◽  
Metal Structures ◽  
Long Operation ◽  
Standard Tests

The article examines the residual life of load-bearing metal structures (NMC) of special cars for the transportation of special contingent on the basis of the results of technical diagnostics and standard tests. Most scientific publications investigate the increase in the service life of different types of passenger cars by improving their design properties. The following methods are used in the study: resetting from wedges, resource tests for impact strength, impact tests, static strength tests. On the basis of carrying out technical diagnostics and standard tests the possibility of establishment of new appointed service life of cars is defined. The residual resource was set at one of the minimum calculated values obtained by mathematical dependence to calculate the residual service life. When determining the residual resource during the standard tests, the evaluation of the fatigue resistance margin was performed taking into account the stress of the load-bearing structures of the car during the tests. It is concluded that the condition of load-bearing metal structures of special wagons for transportation of special contingent after long operation does not approach the limit. The obtained practical and theoretical results make it possible to extend the service life of special wagons for the transportation of special contingent beyond the established by the manufacturer.

scholarly journals Modeling of corrosion-mechanical behavior of multi-element metal structures of transport works in real-world conditions

2019 ◽  
Vol 6 (3) ◽  
Author(s):  
Valentin Chernykh
Keyword(s):  
Corrosion Damage ◽  
Corrosive Wear ◽  
Joint Effect ◽  
Euler Method ◽  
Arbitrary Cross Section ◽  
Corrosion Wear ◽  
Corrosive Media ◽  
Intermediate Point ◽  
Railway Bridges ◽  
Metal Structures

The article is part of the author’s dissertation research. Multi-element metal structures are widely used in the construction of transport structures (metal spans, trusses of railway bridges, overpasses, etc.). During operation, such structures are subjected to the joint effect of loads, temperatures, and corrosive media. In accordance with this, the task of predicting the behavior of such structures seems to be relevant. It consists in the development of effective models oriented to the calculation of the bearing capacity of structural elements subjected to corrosive wear. The article discusses the most common corrosion damage to metal multi-element structures of transport facilities, the classification of corrosion processes according to the nature of the surface destruction, the main types of metal elements and bridge structures. The main parameters characterizing the corrosive wear of metal structures were determined. Ways to account for the effect of aggressive environment on metal structures, i.e. well-known mathematical models and work, in which attention is paid to the problem of corrosion, wear modeling. The process of identifying corrosion wear models (determining unknown model coefficients) is described. The system of equations for determining the coefficients of a mathematical model of corrosive wear is given. The values of the coefficients of the models used to predict the behavior of structures, with a different choice of an intermediate point are given. A statically indefinable flat five-element truss of arbitrary cross section, part of the rods of which works in tension and part in compression is considered. For this design solves the problem of assessing durability. To solve this problem, use the corrected Euler method. The obtained numerical values of the durability of trusses of five rods, depending on the lengths of the rods.

scholarly journals Team Approach Or Individual Approach: A Statistical Analysis Of The Impact Of Socioeconomic Heterogeneity On Students Preference In Writing Term Papers In Management Courses

2007 ◽  
Vol 2 (3) ◽  
pp. 37-44
Author(s):  
Tyler T. Yu ◽  
Victoria Johnson ◽  
Miranda M. Zhang ◽  
Lloyd Southern
Keyword(s):  
Statistical Analysis ◽  
Team Approach ◽  
Freedom Of Choice ◽  
Individual Approach ◽  
Significant Relationships ◽  
Term Papers ◽  
Students Attitudes ◽  
The Impact ◽  
Individual Effort ◽  
Socioeconomic Heterogeneity

The purpose of this paper is to examine students preference in writing term papers in management courses. Specifically, students attitudes and preferences toward the choices, i.e., whether it is written as an individual effort, or as a team effort, are examined. These choices (individual approach, team approach, freedom of choice and indifferent) are then tested against a set of socioeconomic factors to see if there are significant relationships among the variables. The paper reports the empirical findings of the study.

scholarly journals Reinforcement of metal structures by external reinforcement by gluing high-strength fiber-reinforced systems: analytical approach

2021 ◽  
pp. 19-21
Author(s):  
Iryna Rudneva
Keyword(s):  
High Strength ◽  
Structural Defects ◽  
Fiber Reinforced ◽  
Load Bearing ◽  
Metal Structures ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Industrial Buildings ◽  
External Reinforcement ◽  
High Strength Fiber

Ukraine's construction heritage includes numerous examples of the use of metal structures, especially those used in industrial buildings and high-span structures. The use of metal structures in construction is due primarily to their mechanical properties. They are frost-resistant and can withstand temperatures down to -65 degrees, hard, durable, strong and reliable. They can also be used in areas with high seismic activity. But, as in the case of other types of structures, there is a need to restore or strengthen metal structures due to structural defects, wear of load-bearing elements, as well as to increase the load-bearing capacity. In some cases, reinforcement with fiber-reinforced polymer composites (FRP) gives a better result compared to traditional methods of reinforcement using metal

scholarly journals Technical condition of welded load-bearing metal structures of operated agricultural hoisting cranes

2020 ◽  
Vol 175 ◽  
pp. 11005
Author(s):  
Alexander Scherbakov ◽  
Anna Babanina ◽  
Ivan Kochetkov ◽  
Pavel Khoroshilov
Keyword(s):  
Plastic Deformation ◽  
Metal Structure ◽  
Technical Condition ◽  
Technical Diagnostics ◽  
Low Alloy Steels ◽  
Low Carbon ◽  
Load Bearing ◽  
Metal Structures ◽  
Elastic Plastic ◽  
Alloy Steels

The paper considers the methodology for assessing the technical condition of welded load-bearing metal structures of operated agricultural hoisting cranes. In the course of the study, the relationship between structural, mechanical and magnetic parameters was established during cyclic elastic-plastic deformation of low-carbon and low alloy steels. Based on the analysis, it was concluded that the dependence of the minimum values of the magnetic parameter on the acting stresses Нр(σ) is influenced by the metal structure and its chemical composition. It has been established that the coarser-grained structure of the studied steels under elastic-plastic deformation contributes to a shift in the minimum values of Нр towards lower acting stresses; an increase in the strength characteristics of steels shifts the minimum of Нр toward large values of s, which must be taken into account when conducting technical diagnostics of the elements of the operating metal structures of hoisting cranes. Based on the results of the study, a method for determining the acting stresses in the elements of the metal structures of hoisting cranes was developed, which, by the nature and magnitude of the change in the residual magnetization of the scattering field during their stepwise loading (unloading), allows judging the magnitude of the acting stresses. The work also presents a methodology for assessing the technical condition of welded load-bearing metal structures of hoisting cranes based on the integrated use of passive flux-gate and other control methods, which allows determining the acting stresses used in strength calculations in the identified hazardous zones of concentration of stresses in the elements of metal structures.

Experimental investigation of contactless thermal control of freight rolling stock tread brakes

2021 ◽  
pp. 20-25
Author(s):  
Alexander Anatolyevich Mironov ◽  
◽  
Dmitriy Nikolaevich Saltykov ◽  
Alexander Eduardovich Pavlyukov ◽  
Pavel Igorevich Shalupina ◽  
...  
Keyword(s):  
Experimental Data ◽  
Experimental Investigation ◽  
Numerical Modeling ◽  
Statistical Analysis ◽  
Thermal Condition ◽  
Thermal Control ◽  
Rolling Stock ◽  
Freight Car ◽  
Further Development ◽  
Complex Computer

The paper is devoted to experimental investigation of contactless thermal control of tread brakes. It presents the results of numerical modeling of thermal condition of freight car solid wheel in various modes of braking and thermal control on the basis of developed complex computer model. The authors show the comparison of gained results with experimental data. They have carried out the statistical analysis and revealed the most common forms of signals. As a result, the paper considers the perspectives of the further development of the discussed statements.

scholarly journals On the design of high-rise buildings with a specified level of reliability

2018 ◽  
Vol 33 ◽  
pp. 02061 ◽  
Author(s):  
Andrey Dolganov ◽  
Pavel Kagan
Keyword(s):  
Steel Structures ◽  
Optimal Level ◽  
Structural Scheme ◽  
Load Bearing ◽  
Metal Structures ◽  
High Rise ◽  
Regulatory Documents ◽  
Long Time ◽  
Seismic Impacts ◽  
Different Levels

High-rise buildings have a specificity, which significantly distinguishes them from traditional buildings of high-rise and multi-storey buildings. Steel structures in high-rise buildings are advisable to be used in earthquake-proof regions, since steel, due to its plasticity, provides damping of the kinetic energy of seismic impacts. These aspects should be taken into account when choosing a structural scheme of a high-rise building and designing load-bearing structures. Currently, modern regulatory documents do not quantify the reliability of structures. Although the problem of assigning an optimal level of reliability has existed for a long time. The article shows the possibility of designing metal structures of high-rise buildings with specified reliability. Currently, modern regulatory documents do not quantify the reliability of high-rise buildings. Although the problem of assigning an optimal level of reliability has existed for a long time. It is proposed to establish the value of reliability 0.99865 (3σ) for constructions of buildings and structures of a normal level of responsibility in calculations for the first group of limiting states. For increased (construction of high-rise buildings) and reduced levels of responsibility for the provision of load-bearing capacity, it is proposed to assign respectively 0.99997 (4σ) and 0.97725 (2σ). The coefficients of the use of the cross section of a metal beam for different levels of security are given.

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