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Purpose. Determination of the stressdeformation state and fatigue strength of the proposed concept of the composite module of the wagon body, designed for the transportation of hard coal and other bulk cargoes that do not require protection from the influence of the external environment (atmospheric precipitation, exposure to high and low temperatures, etc.). Methodology. When conducting research, a systematic approach was used. In order to achieve the goal set in the research, the following tasks were solved: to determine the features and consider the impact of hard coal on the structural components of the body module of a coal wagon; to do nodebynode and elementbyelement analysis of the engineering complex of documents for the synthesis of the geometricspatial 3D model of the open wagon under investigation; to develop a computer model with the help of a modern computing software complex; to adjust its adequacy on the basis of the obtained mathematical data by applying the semimomentless theory of shells; to apply calculated loads that are characteristic of the defining case; by means of simulations, to determine graphical representations of stressstrain states; to check fatigue strength by computer simulation method. Findings. A computer model was developed with the help of a modern computing software complex. The adequate finiteelement model includes: the number of mesh elements 911,782, nodes – 1,551,011, while the maximum size of the mesh element is 40.0 mm, the minimum is 13.3 mm. The results of calculating the strength of the developed model of the composite module of the body of a coal carrying wagon from the determination of loads proved that the obtained stresses do not exceed the permissible values. Also, the proposed structure was tested for fatigue strength by calculation method and computer simulations. The results of such analysis are positive. Originality. For the first time, a conceptual implementation of the body module of an open wagon for the transportation of hard coal from a composite material has been proposed. With the help of calculations and computer simulations, the stressstrain state and fatigue strength of the proposed concept were analyzed. Practical value. The created concept of the coal wagon body can be used as a basis for the creation of composite body modules and other wagons, which will be oriented to the transportation of bulk and loose cargoes that do not require protection from atmospheric precipitation. The obtained results will be the basis for further research and development work on the development and implementation of the composite module of the body of a coalcarrying wagon. In the final case, the introduction of this or a similar technology will allow increasing the efficiency of the domestic fleet of freight wagons in the transportation of the specified bulk cargoes. [ABSTRACT FROM AUTHOR]

Purpose. Highlighting the results of the analysis of the stress-deformed state of the wagon body of the 918 model under non-typical loads with bulk cargo. Such an analysis was carried out with the aim of investigating the possibility of transportation of various types of bulk cargo (for example, various types of raw materials, agricultural products, construction materials, etc.) in the existing design of the section of the refrigerated wagon. Methodology. In order to ensure uninterrupted railway transportation in today’s difficult conditions, it is proposed to use scientific and applied approaches to develop the possibility of using existing models of wagons for types of transportation that are not typical for them. Namely, to consider the possibility of using refrigerated wagons for the transportation of bulk cargo. A systematic approach is used to conduct such research. This included: determination of the study of the specifics of the impact of bulk cargo on rolling stock structures; analysis of design and technological documentation to create a spatial 3D model of the wagon under investigation; creation of a calculation model using a modern software complex; checking the adequacy of the developed model and the accuracy of the data obtained with its help; application of non-typical design loads; obtaining and analyzing pictures of stress-strain states by the finite element method. Findings. A 3D model of the body module of the model 918 wagon was developed. The results of the analysis of the equivalent stress plot according to the first mode proved that the greatest stresses are 800 MPa, that is, they significantly exceed the permissible ones. According to the third mode, the highest stresses are 320 MPa and also exceed the permissible ones. The results of the analysis of the plot of equivalent stresses, which occur during expansion, proved that the loads are excessive. The cladding, supported only by racks, cannot hold the load from the bulk cargo. Originality. A strength analysis of the existing design of a refrigerated wagon section was conducted under non-typical bulk cargo loads. Practical value. The obtained results of the analysis of the stressed-deformed state of the body of the model 918 wagon when loaded with bulk cargo made it possible to assess the potential possibilities of such transportation. It is expedient to use such results when carrying out research and development works on the improvement (modernization) of the existing sections of refrigerated wagons to ensure the possibility of transporting bulk cargo in them. This, in turn, will increase the efficiency of the domestic fleet of freight wagons. [ABSTRACT FROM AUTHOR]