Study of steam turbine blade degradation Part 2 - Damage mechanical model of blade materials during long term service

Authors
Citation
Xh. Yang et Wz. Dui, Study of steam turbine blade degradation Part 2 - Damage mechanical model of blade materials during long term service, MATER SCI T, 17(5), 2001, pp. 556-558
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science & Engineering
Journal title
MATERIALS SCIENCE AND TECHNOLOGY
ISSN journal
0267-0836 → ACNP
Volume
17
Issue
5
Year of publication
2001
Pages
556 - 558
Database
ISI
SICI code
0267-0836(200105)17:5<556:SOSTBD>2.0.ZU;2-G
Abstract
A damage mechanical model has been proposed from the theory of continuum da mage mechanics that describes the service damage evolution of steam turbine blade materials during long term service. In the model, the damage variabl e is selected according to the variation in fatigue limit of the blade mate rials after service. Furthermore, a model of the degradation of fatigue str ength during service has been created. The experimental results are in good agreement with the model. Compared with the low cycle fatigue damage model , the strength design of the blade is conservative early in its service lif e. If the degradation in fatigue strength is not taken into account, the li fe prediction of the blade is inadequate for long term service lives. (C) 2 001 IoM Communications Ltd.