Research On The Fatigue Strength Of Hopper Car Body

According to the progress and development trend of domestic and international rail wagons, substantially higher logistics costs in China’s railway transportation, loading and unloading charges. In order to reduce logistics costs, improve transport efficiency, the development of automated handling of special vehicles will become the direction of development of rail freight hopper car is dedicated automated loading and unloading vehicles. China railway wagon design techniques developed countries there is still a gap between the vehicle static strength analysis and fatigue analysis, advanced simulation using ANSYS finite element analysis software, optimized design, in order to improve the safety and reliability of operation of the vehicle.Finite element analysis software for car body static strength analysis and the steel fatigue analysis the theory, to study the mathematical properties, can be used to calculate the theoretical and discrete principle, optimize the structure shape and size, find out the to improve body steel structure of the static strength and fatigue strength method. This chapter also describes the composition of the AAR standard design of railway wagons in China with international standards is bound to follow the international standard and be bound by the standard AAR mainly through standard coordination among members of the security and transport issues.This paper introduces the funnel car body steel structure, material, technical parameters; finite element model of the hopper car bodywork, discrete processing, AAR-based finite element calculation of the boundary conditions, assessment standards; fatigue calculation mechanism, theory, and Processing method and so on. Funnel car body static strength analysis and fatigue analysis using ANSYS simulation software, the calculation of the preliminary design, four stress exceeds the AAR standards for the calculation results are recalculated after the optimization design, the optimized hopper car bodywork strength to meet the requirements of the AAR standards, the maximum stress436.43MPa extension of the site in the first condition of the lower part of the side wall panels rely on the car side R300, less than Q450NQR1440MPa high strength weathering steel allowable stress.According to the AAR standards to determine the fatigue calculation condition, after computational analysis shows that the relatively weak position of the car body fatigue life as a funnel with traction beam welds the bolster under cover tail and side beam welds, heavy vehicle operators by calculating mileage were6.54million km,8.87million km. The empty running a limited impact on the body fatigue life, run 300,000km, empty weight of vehicle mileage consider the ratio of0.9, the calculated fatigue life, the car body fatigue life more than20years.Many factors that affect the body fatigue life, such as the use of the environment, materials, welding technology and load conditions, pointed out that the fatigue analysis method from the point of view of fatigue the appropriateness of the design, the weakest part of the process quality control, can improve the overall service life of the vehicle.