Perpustakaan Digital ITB

The presence of high-speed trains signifies advancements in the railway industry. Such example is the Kereta Cepat Merah Putih (KCMP) project. The loads experienced by high-speed trains are quite diverse, thus their structure needs to be analyzed. In this study, the focus of the structural analysis of KCMP high-speed train made from Al 6061-T6 is fatigue, crack, and plasticity analysis. There are two research methods, namely experiment and numerical simulations. The conducted experiment is the fatigue crack growth experiment, with the goal of obtaining crack growth rate curves and fatigue characteristics. There are two numerical simulations, namely crack simulations on plates and three-point bending simulation on profiles. Crack simulations are performed with five different crack-to-width ratios. The purpose of this simulation is to establish a relationship between crack-to-width ratio and the geometric factor (????) as well as to obtain an accurate crack modeling. Elastoplastic property effect is observed in the crack simulations. Threepoint bending simulation is conducted to visualize plastic deformation on profile. From the experiment, crack growth rate curves and fatigue characteristics of Al 6061-T6 are obtained, and they are comparable with similar experiments despite an anomaly. However, it should be noted that only a handful of specimens were tested. From the crack simulation results, it is found that a larger crack-to-width ratio results in a larger ????. Crack simulation also produce ???? values that are very similar to a reference ????. It is known that elastoplastic properties affect the structure when the load is massive. Plastic deformation on the profile in three-point bending simulation and threepoint bending experiment indicates a sign of similarity qualitatively.