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
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
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