Fatigue Analysis of Welded Joint on Metro Capsule’s Bogie Frame

• Main Author: Didik Supriyadi, Rachmad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/45882
• Institution: Institut Teknologi Bandung

Metro capsules are mass transportation that are being developed by PT Teknik Rekayasa Kereta Kapsul (TReKKa), PT Bandung Mechatronic Center (BAMEC) and Institut Teknologi Bandung. At present, metro capsules enter the prototype test and certification phases. One of the tests to be performed is dynamic testing on the bogie frame. The process of dynamic testing requires a long time and a large cost. Therefore, fatigue analysis is needed to determine the strength of the design created. The component that must be analyzed is the bogie frame’s welded joint because the welded joint was cracked in the previous test. In this final project, fatigue analysis is focused on welding joints at critical points. Fatigue analysis is performed using the finite element method and the effective notch stress method. Analysis of fatigue begins with fatigue simulation on the bogie frame model without welded joint. The simulation results are used to determine the critical point and create submodels with welded joints at the critical point. Then, the submodel is simulated to determine the stress at the welded joint. The simulation results on the submodel are used to calculate the fatigue life of the welded joint. Based on the analysis, the minimum fatigue life of the welded joint is 1.75 × 10 cycles for the first stage. The fatigue life is less than the minimum fatigue life required by EN 13749 which is 6 × 106 cycles for the first stage. One of the causes of the low fatigue life of a welded joint is the stress concentration around the welded joint. The design needs to be improved to increase the wear life of the welded joint.