Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 53 10 2021 12 22 Simulation of Pitting Corrosion on Gas Turbine Compressor Blade Simulation of Pitting Corrosion on Gas Turbine Compressor Blade 5123 5140 4411 10.22060/mej.2021.19342.7003 FA Yousef Mollapour Department of Mechanical Engineering, University of Zanjan, Zanjan, Iran Esmaeil PourSaeidi Mechanical engineering departmant.university of zanjan Journal Article 2020 12 04 The first row rotating blades of four axial-flow compressors were prematurely fractured. Previous investigations showed that the site atmosphere contains corrosive compounds which lead to an increase in the possibility of pitting on the blades. To this end, experimental and numerical studies are considered. Replica testing, scanning electron microscope and fractography of the broken blade indicate that the pits join together and make one bigger pit under stress-corrosion cracking mechanism which reduces the failure time. 3-D models of the pitting on the blade under existing forces are analyzed by COMSOL Multiphysics software. Finite element analysis shows good similarities with fractography photos. Stress concentration and interaction of stresses around the pits are two mechanical reasons for the initiation and growth of cracks. Calculations show that the occurrence of stress-corrosion cracking at the location of the pit reduces the crack initiation time to half. The presence of pits increased the stress by approximately 130 MPa relative to the healthy blade. The part between the two pits with a stress of approximately 180 MPa showed the interaction of the two pits in the operating conditions of the compressor blade. The first row rotating blades of four axial-flow compressors were prematurely fractured. Previous investigations showed that the site atmosphere contains corrosive compounds which lead to an increase in the possibility of pitting on the blades. To this end, experimental and numerical studies are considered. Replica testing, scanning electron microscope and fractography of the broken blade indicate that the pits join together and make one bigger pit under stress-corrosion cracking mechanism which reduces the failure time. 3-D models of the pitting on the blade under existing forces are analyzed by COMSOL Multiphysics software. Finite element analysis shows good similarities with fractography photos. Stress concentration and interaction of stresses around the pits are two mechanical reasons for the initiation and growth of cracks. Calculations show that the occurrence of stress-corrosion cracking at the location of the pit reduces the crack initiation time to half. The presence of pits increased the stress by approximately 130 MPa relative to the healthy blade. The part between the two pits with a stress of approximately 180 MPa showed the interaction of the two pits in the operating conditions of the compressor blade. https://mej.aut.ac.ir/article_4411_e243aa93e6b6e031797f86d0858f5e40.pdf