>
Fa   |   Ar   |   En
   An Outrun Competition of Corrosion Fatigue and Stress Corrosion Cracking on Crack Initiation in A Compressor Blade  
   
نویسنده Poursaeidi E. ,Pedram O.
منبع International Journal Of Engineering - 2014 - دوره : 27 - شماره : 5 - صفحه:785 -792
چکیده    The first row rotating blades of four axial-flow compressors fractured prematurely. previous investigations had shown that the atmosphere of the site contained corrosive compounds which lead to an increase in possibility of pitting of the blades. it was also revealed that the crack was originated from two corrosion pits. thus, this work is conducted to ascertain which of the fatigue or stress corrosion cracking (scc) mechanisms is predominant in transition of pits into initial cracks. to this end, experimental, numerical and theoretical studies are considered. replica testing, scanning electron microscope (sem) and fractography of the broken blade indicate that the pits join together and make one bigger pit under scc mechanism which reduces the failure time. 3-d models of the pitting on the blade under existing forces are analyzed by abaqus software. the simulation results show the location of maximum stress concentration inside one of the pits which is compatible with the location of initial scc crack. theoretical and numerical analysis show that stress intensity range (δk) around the pits is smaller than threshold stress intensity range ( δkth); thus, cracks initiate and propagate at the mouth of the pits under scc mechanism. then, the pits join together and make one equivalent pit, so that δk reaches the δkth and finally crack propagates under fatigue mechanism.
کلیدواژه Corrosion Pitting; Custom 450; Gas Turbine Compressor Blade; Stress Corrosion Cracking
آدرس Zanjan University, ایران, Zanjan University, ایران
 
     
   
Authors
  
 
 

Copyright 2023
Islamic World Science Citation Center
All Rights Reserved