Stress evaluation method for As-weld welds of bogie frames for railway vehicles

摘要

The stress evaluation method according to the present invention is a finite element model based on a solid model of a trolley frame having a post-maintenance weld in which the As-weld weld is maintained so that the weld toe has a smooth shape with no corners. The second step of calculating the stress generated at the weld toe of the weld after maintenance by executing the finite element method analysis using the first step to create the weld and the finite element model created in the first step. And, using the stress calculated in the second step and the notch coefficient or stress concentration coefficient of the weld toe of the weld after maintenance, the nominal stress of the weld after maintenance is calculated, and this is used for As-weld welding. Using the third step, which is regarded as the nominal stress of the part, the nominal stress of the As-weld weld obtained in the third step, and the notch coefficient of the weld toe of the As-weld weld measured in advance, It includes a fourth step of calculating the stress generated at the weld toe of the As-weld weld.