To study the influence of different scale finite element models on the strength analysis of subway ve-hicle underframe bearing structure,the finite element models of a certain type of subway MP vehicle with dif-ferent scales are constructed for simulation analysis,and it is compared with the static load test of the actual vehicle structure based on line load.The results of the finite element models and experiment show that at the complex weld positions,the maximum relative error of the shell-solid multi-scale model calculation results is 18%,while the maximum relative error of the two shell element models calculation results is 54%.The calcu-lation results are sensitive to grid size,and the larger the grid size result in the greater error.The shell-solid multi-scale model has higher calculation accuracy and can reflect more accurately the stress distribution of the chassis load-bearing structure in the weld area and plate thickness direction.In the area far away from the weld seam on the plate surface,the maximum relative error of the shell solid multi-scale model and shell ele-ment model calculation results is less than 20%,and they are not sensitive to the grid size.The shell element model has advantages in saving computational resources.
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