Research On The Pressure Distribution Regularities From Granular Cargo To Special Coal Gondola Car

The gondola car is the main vehicle of China railway transportation. It is mainly used to transport coal, ore and other granular cargo body. In practical applications, local damage phenomenon appears on the gondola car after long-term operation. It is confirmed that the lateral pressure of granular cargo to the gondola car is a main load factor causing the damage.The current standard is only applicable to the gondola car with load under 80t, so for the gondola car with greater load calculation of the lateral pressure in accordance with current standards cannot meet the design requirements for the gondola car with greater load. In this paper, C80B is chosen as the research object. The main contents are to get the distribution of lateral pressure that granular cargo applying on the end and side wall of the gondola car under various conditions and analyze different parameters. The results can afford reference to improve design of the new gondola and perfect the relevant calculation standard.To begin with, impact simulation on fully loaded gondola car is utilized with nonlinear finite element method. Drucker-Prager yield criterion is applied to describe the physical characteristics of the granular cargo. Different conditions are selected according to the relevant specification. Impact results are evaluated through the analysis of couplers impact force, dynamic stress of car and the relative deformation on the end wall. And the motion law is summarized by the changes of the velocity of the impacted car in the impact process.Secondly, based on the particle discrete element method, models of gondola and granular cargo are built and dynamic simulation on shunting conditions of gondola car is operated on the three dimensional particle flow program (PFC3D) platform with FISH Language. Then,the study focuses on the distribution of lateral pressure that granular cargo applying on the end and side wall of the gondola car on horizontal and vertical direction and the comparison of the results of the impact car and the impacted car. Given the simulative results of various conditions, the change rules of the lateral pressure of the end and side wall along with the impact acceleration is concluded. Analyze different operating phases of the gondola car and compare the requirements of different phases with relative norms.In the end, dynamic simulation of gondola car under the vertical small vibration condition and curve movement condition is operated, with the purpose to get the distribution of lateral pressure that granular cargo applying on the end and side wall of the gondola car on the basis of the established discrete element model of gondola car and dispersion.