Fretting cracking behavior of nub of last-stage blade for steam turbine
- Authors
- Kim, Kihyeon; Cho, Sung-San; Hwang, Dong Hyeon
- Issue Date
- Apr-2020
- Publisher
- KOREAN SOC MECHANICAL ENGINEERS
- Keywords
- · Fretting cracking · Contact force · Nub-sleeve part-span damper · Last-stage blade for steam turbine
- Citation
- JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, v.34, no.4, pp.1523 - 1529
- Journal Title
- JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
- Volume
- 34
- Number
- 4
- Start Page
- 1523
- End Page
- 1529
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/11767
- DOI
- 10.1007/s12206-020-0314-1
- ISSN
- 1738-494X
- Abstract
- Nub-and-sleeve of last-stage blade for steam turbine is a part-span damper. The nub is vulnerable to fretting cracking since it is in contact with the sleeve under centrifugal force, and a small-amplitude oscillatory movement occurs at the nub-sleeve contact interface due to the blade vibration during operation of turbine. The present study developed a rig test that mimics fretting behavior at the nub-sleeve contact interface and reproduces fretting cracking of the nub. The rig tests reveal that fretting cracking occurs if the contact interface is in partial slip state and the tangential contact force amplitude is sufficiently large. The minimum tangential contact force amplitude for cracking increases with the normal contact force. Moreover, under the partial slip condition, the tangential contact force amplitude increases with the imposed displacement amplitude and its maximum value increases with the normal contact force.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > Department of Mechanical and System Design Engineering > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/11767)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.