Peculiarities of determining the bearing structure load of the body of articulated open wagon made of round pipes

The article highlights the peculiarities of creating a wagon of articulated type, the supporting elements of which are made of round pipes. To determine the dynamic load of an open wagon, a mathematical model has been developed, which includes the movement of the open wagon body during the action of longitudinal force on the automatic coupler. The mathematical model solution has been implemented using the Runge-Kutta method in the MathCad software. Accelerations obtained as a component of dynamic load have been taken into account when calculating the strength of the bearing structure of the wagon body. The strength analysis has been carried out using the finite element method implemented in the CosmosWorks software. The results of the calculations showed that the maximum equivalent stresses are within the permissible ones. The strength margin of main elements of the wagon bearing structure and the critical oscillation frequencies are determined. The conducted research will help to develop recommendations on the design of articulated open wagons and increase their operation efficiency. (paper)