PSI - Issue 59

J. Gerlici et al. / Procedia Structural Integrity 59 (2024) 66–73 Juraj Gerlici et al. / Structural Integrity Procedia 00 (2023) 000 – 000

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Fig. 8. Displacements in the open wagon body with sandwich panel walls

Therefore, the maximum stresses in the body occurred in the zones of interaction between the cross bearers and the centre sill; they amounted to about 130 MPa. In the side walls, the maximum stresses were recorded in the outer sheets of the sandwich panels located behind the bolster beams of the body. They amounted to about 105 MPa and were lower than those acting in a typical design by 3.5%. The maximum displacements in the open wagon body were recorded in the middle part of the frame – 3.8 mm. In the side wall, the maximum displacements were in the sandwich panels located behind the body centre and they were equal to 2.5 mm. 4. Conclusions 1. Mathematical modelling of the dynamic load of the open wagon body with sandwich-panel side walls has been carried out. It has been found that the maximum acceleration acting on the open wagon body is 1.73 m/s2, which is 4.1% lower than that acting on a typical open wagon. The calculation included the stiffness coefficient of the energy- absorbing material 2.5 kN/m and the viscous resistance coefficient 3.0 kN ∙ s/m. 2. The strength of the open wagon body with sandwich panelling of the side walls has been calculated using a predefined thickness of the sandwich panel sheet of about 3 mm. With this in mind, a spatial model of the body was built and a strength calculation was made using the finite element method. It has been found that the maximum stresses in the body occur in the zones of interaction between the cross bearers and the centre sill and they are about 130 MPa. The maximum stresses in the side walls occur in the outer sandwich panel sheets placed behind the bolster cross-sections of the body, and they are about 105 MPa. The resulting stresses are lower than those acting in a typical design by 3.5%. The maximum displacements in the open wagon body are recorded in the middle part of the frame and they are 3.8 mm. For sandwich panels, the maximum displacements are 2.5 mm. The research results will contribute to the scientific development database of innovative wagon designs with improved technical and economic characteristics and increase the efficiency of railway transport. Acknowledgements This work has been supported by the project KEGA 031ZU-4/2023: Development of key competencies of the graduate of the study program Vehicles and Engines. This research was also supported by the Slovak Research and Development Agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic in Educational Grant Agency of the Ministry of Education of the Slovak Republic in the project and VEGA 1/0513/22 “Investigation of the properties of railway brake components in simulated operating conditions on a flywheel brake