PSI - Issue 36

O. Fomin et al. / Procedia Structural Integrity 36 (2022) 239–246 Oleksij Fomin, Alyona Lovska, Volodymyr Bohomia et al. / Structural Integrity Procedia 00 (2021) 000 – 000

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Keywords: Transport mechanics, tank wagon, load-bearing structure, dynamic loading, coefficient of fatigue resistance

1. Introduction Ensuring the competitiveness of the transport industry necessitates the introduction of innovative rolling stock structures. When creating such structures, fundamentally new solutions must be taken into account, which will help to ensure its strength and reliability in the conditions of operational loads. It is also possible to implement such solutions on already operated rolling stock during upgrades or repairs to increase the efficiency of its operation (Soloviova et al. (2020), Strelko et al. (2019)). It is known that the transportation of liquid cargo by railway is carried out mostly by tank wagons. Wagons of this type experience a significant dynamic loading in operational conditions due to the characteristics of the goods transported in them. To ensure the strength of the load-bearing structures of tank wagons, as well as the safety of their operation, it is important to implement measures to reduce the dynamic loading. This will help to reduce the costs of maintaining tank wagons, as well as contribute to the possibility of extending the service life of already operated ones. Improving the load-bearing structure of a tank wagon by using a protective device upon collision was covered in paper by Kravchenko et al. (2021). The results of the calculation of strength of the protective device were given. In this case, the calculation was made for a narrow gauge tank wagon. In work ( Šťastniak et al. (2020)) the substantiation of application of the improved design of protective elements of bottoms of the tank wagon pot was given. The calculation of strength was implemented for a case when a tank wagon collides with an impact force of 150 kN in accordance with the RID TE25 standard. It is important to say that the proposed improvement measures do not reduce the dynamic loading of the load bearing structure of a tank wagon at operational modes. Development of design and experimental methodology for forecasting reliable and efficient operation of a tank wagon was carried out in publication by Voropai (2015). A method for estimating the remaining service life of a tank wagon was proposed. Calculations were made for the tank wagon of model 15-1408-10 for the transportation of liquefied gases. Prediction of fatigue strength of a tank wagon pot after 40 years of operation was carried out in work (Putyato and Belogub (2013)). A method for determining the coefficient of fatigue strength reserve of the most laden components of the tank wagon pot was given. However, the authors did not propose technical solutions to extend the service life of a tank wagon. In paper (Vatulia et al. (2017)), the supporting parts of the pot and the frame of a tank wagon were improved. The proposed solutions were confirmed by strength calculations implemented in the LIRA software package. The results of improving a tank wagon by creating a multilayer pot structure were covered in work (Jeong et al. (2009)). The strength calculation results were performed numerically using nonlinear analysis by the method of finite elements. At the same time, the proposed solutions will cause difficulties in the maintenance and repair of a wagon. Measures to increase the efficiency of operation of tank wagons by improving their designs were given in publication by Atamanchuk and Tsyganskaya (2013). A two-section design of a tank wagon with improved operational indicators was offered. However, the authors did not propose solutions to reduce the loading of the load bearing structure of a tank wagon. In works by Lovska and Fomin (2020), Fomin et. al. (2021) the substantiation of introduction of dissipative links in load-bearing structures of vehicles was given. The proposed solutions were confirmed by the results of mathematical and computer modelling of their loading at operational modes. At the same time, the issue of reducing the loading of the load-bearing structures of tank wagons was not paid attention to. Analysis of literature allows us to conclude that the issues of reducing the dynamic loading of the load-bearing structures of tank wagons are relevant and need research.