Axle Load 40t Of Ore Gondola Car Body Structure Non-linear Analysis

The fact that the heavy load transportation technology is the direction of railway freight transportation development has been recognized all over the world, and lightweight design of car body has been a key problem for heavy freight trains. As car-body of railway vehicles becomes more and more lightweighted, structural stability and non-linear problem will be paid more and more attention to when calculating static strength.The car body of the axle load 40t gondola for ore analyzed in the present paper is of thin-walled structure. The design and calculation of the car body are of American AAR standard. The compressive force in the heavy load compression case required by AAR standard is 4450kN,which is about 2 times as much as 2250kN prescribed by TB/T1335-1996《strength design and experimental appraisal standard for railway vehicles》in our country, therefore, it is necessary to analyze the stability of the car body. Stability analysis can be divided into linear stability analysis and nonlinear stability analysis, with the former only applied in limited situations. Because the deformation effects before buckling are often overlooked, the over-estimation of the critical load of the structure often happens. Therefore, it is necessary to analyze most of the practical structures with nonlinear stability means.This paper analyzed the stability of the car body structure by eigenvalue linear and nonlinear buckling analysis in the heavy load compression case, and the result of the analysis showed that before reaching the compression load 4450kN required by the AAR standard, the car body showed buckling, and the stability could not meet the requirements, therefore the car body structure must be optimized. This paper then analyzed the stability of the optimized car body by linear and nonlinear means again. And the result of the analysis showed that the optimized car body could meet the stability requirements. Then, this paper analyzed material nonlinearity of the optimized car body in the impact load case, and the result of the analysis could also meet the AAR standard.