As there are many factors which affect blade life can not be analyzed exactly, it is difficult to evaluate service life of blade by numerical analysis. Firstly, by introducing Neuber’s rule and the rainflow counting method, based on dynamic stress, a model to evaluate the fatigue life of steam turbine blade has been developed. Secondly, based on fatigue life analysis and fuzzy comprehensive evaluation, a synthetic method for service life assessment of blade considering many uncertain factors has been developed. At last, Life assessment of a 323mm blade was carried our and reasonable result was obtained, so the method is usable for engineering application.
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