CALCULATED SIMULATION OF THE DYNAMICS OF A RAILWAY WHEEL WHEN ROLLING THROUGH A BUTT CLEARANCE

The article is devoted to the description of the creation of a computer model of the movement of a railway freight car along the section of the track adjacent to the rail joint. The model takes into account the elastic characteristics and ballast subsidence in the joint zone. The results of computer simulation are further used to solve the contact problem in the wheel-rail system. The study varied a number of parameters affecting this process of wheel movement. For the operating speeds of the freight car, the range of values ​​of the dynamic forces arising between the wheel and the rail during the passage of the joint is determined.

Study on Continuous Cooling Transformation and Microstructure of 500 Mpa Grade Steel for Railway Freight Car Body

Complete the composition design and laboratory smelting of high strength weathering steel for railway freight car body of grade 500MPa. The actual continuous cooling transformation curve (CCT curve and cold speed of 0.5-50 °C/s) was measured through the Gleeble3500 thermal simulation test machine with expansion method and alloy phase method, observing the microstructures by optical microscope and SEM. The hardness of the samples under different cooling rates were measured by Vivtorinox hardness tester. Study on the effect of cooling rates on the microstructures and hardness of the steels.