ANALISA PENGARUH PERUBAHAN VARIASI RPM TERHADAP FATIGUE PADA PROPELLER
The propeller is one of the important components in a ship because without it a ship will not be able to perform its functions and uses. The propeller itself must be able to withstand the forces acting on the blade due to hydrodynamic loads. The strength of the propeller material when it is given a continuous load will cause the material to reach the point of fatigue, which can lead to cracks and eventually fracture. The purpose of this study is to compare the thrust and fatigue life of the propeller type B4-55 with the variation of RPM (268RPM, 201RPM, 135RPM) and also the shipping period (200 days, 250 days, and 300 days). The analysis was carried out with Computational Fluid Dynamics (CFD) based software. The results in this study indicate the difference in thrust value in each variation where the running results obtained the greatest value at 268RPM of 90494KN, 201 RPM of 31434.6 KN, 135RPM of 8956.39 KN. And the location of the hot spot stress is in each variation on the average found in the root back of the propeller blade, The greatest maximum stress is the maximum stress that occurs on the propeller at each variation for the highest at 268RPM of 130.73Mpa, 201 RPM of 37.414Mpa, 135RPM of 10.344Mpa. The longest service life is found on the propeller with a variation of 135 RPM and 200 days resulting in 23.5 years with the longest service life, and at 268 RPM and 300 days the shipping period results in the shortest life span of 11.4 years.