스폿용접부 탈락을 고려한 전동차 구체 강도해석

The spot weld between the side panel and the side-sil of electric multiple unit(EMU) underframe could be detached as the time go on due to the corrosion at the side panel. For this reason, it is necessary to check the structural strength of car-body considering the detachment of spot welds. For this reason, we develop a finite element model of car body of typical EMU by comparing the deflections obtained from the 3 point load test and FE analysis. And then we simulate the detachment between the side panel and side-sil by detaching the nodes in the FE model. We calculate the structural strength of car-body by 3D finite element analysis. The analysis results show that the detachment of spot weld seems to give very small affect the deformation at side-sil which is the one of very important design parameters of car-body. Base on the analysis results, we conclude that the detachment of spot weld may not deteriorate the whole strength of car-body.