Root Cause Analysis of Cracking in Shaft End and Coupling of a High-Power Generator

Root Cause Analysis of Cracking in Shaft End and Coupling of a High-Power Generator J Fail. Anal. and Preven. https://doi.org/10.1007/s11668-018-0468-7 CASE HISTORY—PEER-REVIEWED Root Cause Analysis of Cracking in Shaft End and Coupling of a High-Power Generator . . . . Pablo Bilmes Carlos Llorente Juan Manuel Echarri Toma´s Echarri Angel Martinez Jose´ Zuzulich Submitted: 2 March 2018 ASM International 2018 Abstract Failure analyses and root cause determination produced that spread due to service tensions by a mecha- were carried out on the rotor of a high-power generator of nism of fretting fatigue. The fatigue fracture propagation gas–diesel dual fuel which presented cracking due to tor- was developed into two orthogonal planes at 45 from the sional fatigue in its end (region of section change and longitudinal shaft, which reveals an inversion in the load- coupling), after 30,000 h of service. The generator of 307 ing condition, only justifiable by torsional vibrations that MW–3000 rpm has a rotor (shaft of 400 mm Ø) manu- were assigned to a torsional resonance typical of the system factured in a proprietary steel grade equivalent to ASTM dynamics. It was considered that the torsional vibrations A470 type, Class 7 of high hardenability. It was reported cause micro-movements between components, promoting that the equipment control system showed, in service, http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Failure Analysis and Prevention Springer Journals

Root Cause Analysis of Cracking in Shaft End and Coupling of a High-Power Generator

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Publisher
Springer US
Copyright
Copyright © 2018 by ASM International
Subject
Materials Science; Tribology, Corrosion and Coatings; Characterization and Evaluation of Materials; Classical Mechanics; Structural Mechanics; Quality Control, Reliability, Safety and Risk
ISSN
1547-7029
eISSN
1864-1245
D.O.I.
10.1007/s11668-018-0468-7
Publisher site
See Article on Publisher Site

Abstract

J Fail. Anal. and Preven. https://doi.org/10.1007/s11668-018-0468-7 CASE HISTORY—PEER-REVIEWED Root Cause Analysis of Cracking in Shaft End and Coupling of a High-Power Generator . . . . Pablo Bilmes Carlos Llorente Juan Manuel Echarri Toma´s Echarri Angel Martinez Jose´ Zuzulich Submitted: 2 March 2018 ASM International 2018 Abstract Failure analyses and root cause determination produced that spread due to service tensions by a mecha- were carried out on the rotor of a high-power generator of nism of fretting fatigue. The fatigue fracture propagation gas–diesel dual fuel which presented cracking due to tor- was developed into two orthogonal planes at 45 from the sional fatigue in its end (region of section change and longitudinal shaft, which reveals an inversion in the load- coupling), after 30,000 h of service. The generator of 307 ing condition, only justifiable by torsional vibrations that MW–3000 rpm has a rotor (shaft of 400 mm Ø) manu- were assigned to a torsional resonance typical of the system factured in a proprietary steel grade equivalent to ASTM dynamics. It was considered that the torsional vibrations A470 type, Class 7 of high hardenability. It was reported cause micro-movements between components, promoting that the equipment control system showed, in service,

Journal

Journal of Failure Analysis and PreventionSpringer Journals

Published: May 30, 2018

References

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