Actions for Carrying Capacity Prediction of Steam Turbine Rotors with Operation Damage

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Carrying Capacity Prediction of Steam Turbine Rotors with Operation Damage / V. N. Shlyannikov, B. V. Ilchenko, R. R. Yarullin

Conference Author
Seventh International ASTM/ESIS Symposium on Fatigue and Fracture Mechanics (36th ASTM National Symposium on Fatigue and Fracture Mechanics) (7th : 2007 : Tampa, FL)
Physical Description
1 online resource (13 pages) : illustrations, figures, tables
Additional Creators
Yarullin, R. R., Ilchenko, B. V., Shlyannikov, V. N., American Society for Testing and Materials, and ASTM International
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Summary
This study is concerned with assessing the integrity of cracked steam turbine rotor which operates under creep conditions. Damage accumulation and growth for turbine rotor took place on the inner surface of hole in a shaft. In this case the crack front was nearly half-elliptical shape. The model based on the critical distance concept is presented for expressing crack growth rate in terms of creep damage accumulation in a process zone ahead of the crack tip. An engineering approach to the prediction of residual lifetime of a turbine rotor which is sensitive to the loading history at maintenance is proposed. Full-size stress-strain state analysis of turbine rotor is represented for different stages of lifetime under considering loading conditions. As a result accumulated creep strain in critical zones of turbine rotor depending on time of loading is defined. The creep fracture mechanics parameters that are found numerically are used to characterize the local strain rate and stress fields at any instant around the crack tip in a turbine rotor subjected extensive creep conditions. The meaning of the critical creep ductility appropriate to the stress state at the crack tip is defined as the difference between permissible and accumulated creep strains at different times of loading. Approximate estimations of carrying capacity are presented for the different stress-strain state of a steam turbine rotor at the operation. It is found that the individual mean lifetime of a turbine rotor can be predicted with reasonable accuracy from knowledge of the stress-strain distributives and the material uniaxial creep ductility and creep rupture strength.
Dates of Publication and/or Sequential Designation
Volume 2009, Issue 1508 (January 2009)
Subject(s)
Other Subject(s)
ISBN
9780803169999 (e-ISBN)
9780803134164
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 12.
Other Forms
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2009. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
Source of Acquisition
ASTM International PDF Purchase price USD25.
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