Journal
ENGINEERING FAILURE ANALYSIS
Volume 14, Issue 8, Pages 1476-1487Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfailanal.2007.01.012
Keywords
turbine blade failure; blade vibration; fatigue
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This paper presents an analysis of the cause of steam turbine blade fractures. Recently, several L-0 blades 28.5 (725 mm) long of a steam turbine fractured 5 in. (125 mm) from the blade root platform, causing the forced outage of the turbine. A finite-element analysis (FEA) of the blade was carried out in the beginning of the last decade to calculate the natural frequencies and de vibratory stresses on the blade. A telemetry test was also conducted. The current investigation analyzed the operational data during the last two years, reviewed the results of previous studies, conducted metallurgical investigations, and identified the mechanical and metallurgical modes of the failure. The results of the investigations showed that improper welding of the shroud to the blade was the principal cause of blade fracture. (c) 2007 Elsevier Ltd. All rights reserved.
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