Research On The Strength Of EMU CFRP Equipment Cabin

As the speed of trains continues to increase,higher performance is also required.Traditional materials and structures are technically difficult to meet the comprehensive performance of trains.Composite materials have the advantages of light weight,high strength,high weather resistance and designability,and are widely used in transportation fields such as aviation,aerospace,and ships.Therefore,it is of great theoretical and engineering significance to increase the application research of composite materials in the field of rail transit,especially on the bearing parts.In this paper,the composite equipment cabin structure of high-speed train ia taken as the research object,and the static strength and fatigue strength are analyzed based on the finite element analysis theory.The main research contents are as follows:The finite element model of carbon fiber composite equipment cabin is established.the equivalent mechanical parameters of carbon fiber honeycomb sandwich structure are calculated based on the equivalent theory.The rationality of the equivalent mechanical parameters is verified by the comparison of the local models before and after the equivalent.The static strength and fatigue strength of carbon fiber equipment cabin are analyzed based on the progressive damage analysis method.Using FORTRAN language,The UMAT material subroutine containing unidirectional and bidirectional cloth is compiled,and the progressive damage analysis model of composite laminates under static and fatigue loads are established respectively.The feasibility of the program is verified by simulating the model in the literature and comparing it with the test results.The simulation error is within 10%.Based on the reliable model,the static strength and fatigue strength of the carbon fiber equipment cabin are analyzed,and the weak parts of the structure are obtained.In addition,on the basis of meeting the static strength,the failure load of the carbon fiber equipment cabin is analyzed,and the failure load of the skeleton and the ultimate load of the skirt falling off are obtained.The optimization design of carbon fiber equipment cabin is carried out by using the Opti optimization software.based on the load displacement curve of the,the influence of the lay angle,thickness and order of the composite materials are discussed,and the optimal layer structure of the soleplate is obtained.The free size,size and laying order of the carbon fiber equipment cabin are optimized to realize further lightweight,and thestrength.of.the optimized.carbon.fiber.equipment.cabin is analyzed.The results show that the optimized carbon fiber equipment cabin meets the strength requirements,and the weight is reduced by 21.4%.76 pictures,17 tables,87 references.