Application Research Of Composite Materials On New Metro Bogies

The quality of the bogie is about 40% of the whole vehicle quality.As a key component to support the train body,to withstand and transmit the vehicle load,and ensure the smooth operation of the vehicle,lightweight design of bogie has become a development trend.Compared with traditional steel materials,carbon-fiber reinforce plastic(CFRP)has less than 1/4 density,higher specific strength and modulus,higher fatigue strength,impact strength,lower notch sensitivity and crack propagation speed.Therefore,the application of CFRP to the bogie of subway vehicles is of great significance for the light weight and energy saving of vehicles.In this paper,the new CFRP metro bogie frame and its primary positioning pulling plate are designed,analyzed and discussed.Based on the domestic and foreign structural design and strength analysis methods of carbon-fiber reinforce plastic,the technological characteristics of composite laminate and the properties of existing structures are considered,the structural design and performance analysis of the new metro bogie frame and its primary positioning pulling plate are carried out.And then,the strength and deformation of vehicle frame are simulated and calculated under simulated carrier and extraordinary working conditions.On the basis of simulation results,the static strengthand the fatigue strength of frame are analyzed.Based on the typical laminated-plate elastic theory,and combined with the basic idea of finite element calculation method,the simple symmetric laminated plate is calculated as an example.The normal and off-axis stresses of the example are obtained by theoretical and finite element methods.Based on the two calculation results,the relative errors are both less than 2.5%.Therefore,the accuracy and credibility of the results of finite element calculation method can be verified.The structural design and the laminated optimization for the axle-box primary positioning device of the new CFRP metro bogie are carried out.This plate spring structure is simpler,easy to assemble and convenient for wheel dropping.Its mass is significantly reduced and the size is smaller.It can precisely control design parameters and maintain the stability.The single-layer laminated method should conform to the symmetry principle,the ?45? outermost-layer laminate principle,and the bearing principle for laminating direction.Establish a calculation model for the new CFRP metro bogie frame,According to the standards of UIC615-4 and EN13749,the calculation outline and load conditions are established.The static strength of frame are analyzed by ANSYS.Based on the Lloyd’s Register of Shipping Service Guidelines,the frame strength is assessed.The calculation result indicates that the structural strength can meet the working requirements,and the mechanical properties of the frame structure meet the design requirements.