Stress concentration in compressor blades with pits

The research will address reliability issues of compressor gas turbines with blades suffered from pitting corrosion. Under operating conditions, such pit-like defects is likely to initiate fatigue cracks, thus detrimental to mechanical performance and design life of the blades. In this respect, both...

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Main Author:	Mozafari, Farzin
Format:	Thesis
Published:	2014
Subjects:	TJ Mechanical engineering and machinery
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id	my-utm-ep.41993
record_format	uketd_dc
spelling	my-utm-ep.419932020-07-14T06:04:41Z Stress concentration in compressor blades with pits 2014 Mozafari, Farzin TJ Mechanical engineering and machinery The research will address reliability issues of compressor gas turbines with blades suffered from pitting corrosion. Under operating conditions, such pit-like defects is likely to initiate fatigue cracks, thus detrimental to mechanical performance and design life of the blades. In this respect, both the mechanics and mechanisms of fatigue cracking of the pitted blades should be quantified. The former relates to internal states of deformation and stresses in the blades while the latter identifies dominant materials related failure modes. A mechanistic-based fatigue life model incorporating fracture mechanics aspects of the materials with pit-like defects will then be developed. Finite element simulation with fluid-structure interaction analysis will aid in interpreting fundamental causes of the nucleation of corrosion pits and subsequent fatigue fracture process. Influencing factors including elevated operating temperature, corrosive gas environment and gas flow velocity on the synergistic failure process will be quantified. Results of the mechanics of materials aspects and metallurgical study on martensitic stainless steel turbine blades suffered from pitting corrosion would form the basis for understanding premature fatigue failure of the blades suffered from hot pitting corrosion 2014 Thesis http://eprints.utm.my/id/eprint/41993/ http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:81440?queryType=vitalDismax&query=Stress+concentration+in+compressor+blades+with+pits masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Mozafari, Farzin Stress concentration in compressor blades with pits
description	The research will address reliability issues of compressor gas turbines with blades suffered from pitting corrosion. Under operating conditions, such pit-like defects is likely to initiate fatigue cracks, thus detrimental to mechanical performance and design life of the blades. In this respect, both the mechanics and mechanisms of fatigue cracking of the pitted blades should be quantified. The former relates to internal states of deformation and stresses in the blades while the latter identifies dominant materials related failure modes. A mechanistic-based fatigue life model incorporating fracture mechanics aspects of the materials with pit-like defects will then be developed. Finite element simulation with fluid-structure interaction analysis will aid in interpreting fundamental causes of the nucleation of corrosion pits and subsequent fatigue fracture process. Influencing factors including elevated operating temperature, corrosive gas environment and gas flow velocity on the synergistic failure process will be quantified. Results of the mechanics of materials aspects and metallurgical study on martensitic stainless steel turbine blades suffered from pitting corrosion would form the basis for understanding premature fatigue failure of the blades suffered from hot pitting corrosion
format	Thesis
qualification_level	Master's degree
author	Mozafari, Farzin
author_facet	Mozafari, Farzin
author_sort	Mozafari, Farzin
title	Stress concentration in compressor blades with pits
title_short	Stress concentration in compressor blades with pits
title_full	Stress concentration in compressor blades with pits
title_fullStr	Stress concentration in compressor blades with pits
title_full_unstemmed	Stress concentration in compressor blades with pits
title_sort	stress concentration in compressor blades with pits
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2014
_version_	1747816665766166528

Stress concentration in compressor blades with pits

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