Research For Impact Pressure Distribution Rules On The Freight Train Side Wall

The heavy-duty transportation of the rail way, which is difficult to be substituted by other transportation tools, is an important part in national transportation net because of its high transport capacity and low cost. However, with the vehicle load and the speed increasing, heavy-duty gondola car body appeared serious issues, such as side wall bulge and the root of the crack which has posed a considerable threat on heavy-duty transportation security. Therefore, this article research on heavy-duty gondola C80B body discuss the change rules of impact force and static and dynamic pressure of the side wall while the train running , in order to optimize the side wall structure and provide technical reserves for relevant standards.This paper, based on the domestic and foreign research on lateral pressure on the side wall from the granule goods, use boundary finite element method researching static pressure on the side wall of heavy-duty gondola C80B body. Based on the stiffness equivalence principle to determine the parameters of granular coal, the boundary finite element analysis showed: the side wall static pressure distribution along the side wall height was similar triangle. Contrast with TB / T 1335-1996, AAR standards and related tests of the side wall of the pressure distribution found that: the size of static pressure-side wall approach to the TB / T 1335-1996 in the first condition; the pressure of granular coal surface on side wall is not zero, consistent with the AAR standards; the pressure relaxation at the bottom of side wall consistent with the test results.Based on large deformation finite element method, though the impact finite element analysis of the impact of heavy-duty freight train by wagon granular, the rigid wall and the heavy-duty freight train, carried out the research on the impact pressure distribution rules of heavy-duty coal gondola side walls on the Datong-Qinhuangdao line. Reference impact test, the results calculated based on the four impact velocities show that: with the impact velocity increases, the coupler force, the side wall impact force and the acceleration increase. But as the impact velocity increased, the rate of increasing is decreased; the stress on the side wall supporting root and the side wall side column is large, the whole stress level of the side wall increase relate with the speed increasing, especially at the bottom of the side wall; the side wall dynamic pressure distribution along the height of side wall changing is similar to the trapezoidal , dynamic pressure in the granular surface of coal and bottom of side wall is small, the pressure value almost equal in the central of side wall; with the impact velocity increases, the overall increase pressure side wall, the point of the total force in the side wall shift upon.