Non-probabilistic Stress-fatigue Strength Reliability Model for Turbine Blade
Wencai Sun · Gas Turbine Technology · 2011
The deficiency of the non-probabilistic reliability model proposed by Ben-Haim was discussed and modified.The non-probabilistic reliability model was improved by establishing info-gap(information gap) model with respect to the boundary of failure set.A non-probabilistic fatigue strength reliability model for turbine blade was established based on fatigue strength curves with constant life.The new model simply needs the variation ranges of the stress and strength parameters,the probability density function of parameters are not the necessary.The new model needs less statistic information than the probabilistic reliability models.The new model copes with the 2-demensional uncertainties of the parameters immediately.The numerical example shows the validity of the new model and its consistency with probabilistic fatigue strength reliability method.