Perpustakaan Digital ITB

High-speed trains are one of the land transportation modes being developed in several countries, including Indonesia. The structure of the high-speed train uses aluminum. Aluminum does not have an endurance limit, making fatigue a critical issue in this structure. Fatigue caused by loading can lead to crack initiation, significantly affecting the overall structural integrity. A static load simulation was conducted numerically using ABAQUS software. The static load simulation was performed by applying a vertical load while the train body was under full passenger load conditions. The static simulation showed that the high-speed train body meets the requirements of Peraturan Menteri No. 7. The tensile and shear stress results were 82.36 MPa and 29.2 MPa, respectively, at 25.97% and 9.21% of its yield stress limit. The natural frequency of bending mode exceeded the minimum requirement with a simulation result of 14 Hz. The simulation result for chamber changes -3.4 mm had a 7% deviation from the experimental result. A dynamic load simulation was conducted using ABAQUS for 10 seconds with force and displacement inputs. The force input produced a stable oscillating stresstime history, while the displacement input showed divergence (amplified). The inertia effect significantly influences the stress-time history in dynamic simulations. If the loading configuration depends solely on pressure, the stress-time history will decay overtime due to the absence of inertial forces. Point mass loading generates inertial forces that introduce oscillatory behavior into the system, creating dynamic stress fluctuations. Rainflow counting analysis revealed several locations with high stress range values, points 4, 5, 8, 9, and 13. The highest stress range was found at location 4, a weld point that triggered a geometric stress concentration effect and localized stress due to a mass attachment. At location 4, the structure experienced very rapid failure. Furthermore, the load configuration significantly impacts fatigue life calculations.