F. Li’s scientific contributions

The problems of structural linear static finite element analysis for isotropic materials exist widely in the strength calculation of railway locomotive and vehicle. The formula is derived according to elasticity finite element theory and validated through finite element example. The research is focused on the influence of such material parameters as the elastic modulus and Poisson's ratio on the calculation results. The simple relations between the elastic modulus and the calculation results are obtained under two kinds of displacement boundary conditions. Formula derivation process and analysis results show that whether the finite element calculation can reflect the greatest extent the bearing response of the structure in practical application depends more on determining reasonably the discrete quality and the boundary conditions of structural finite element model besides choosing material parameters. For some force transmission and load bearing structures of railway locomotive and vehicle, elasticity boundary elements must be adopted to provide the elasticity displacement boundary for the calculation model in order to make the calculation results partially and wholly accord with the actual situation.