Enabling Technology for Monitoring & Predicting Gas Turbine Health & Performance in IGCC Powerplants
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چکیده
Service conditions of turbine blades involve fatigue, creep, and environmental corrosion. Themanner in which these mechanisms interact to initiate cracks is complex. These physicalmechanisms have been observed through observation and measurement of damage in adirectionally-solidified (DS) GTD-111 Ni-base superalloy. Experiments include high temperaturelow cycle fatigue with and without dwells and thermomechanical fatigue on both longitudinal (L)and transverse (T) specimens. The impact of exposure to different environments on remainingcrack initiation is identified. A mechanistic-based crack initiation model correlating the evolutionof several possible dominant damage mechanism is proposed. The mechanisms modeled includefatigue, creep-fatigue, and environment-fatigue. The dominant damage mechanism and liferesults are summarized in damage mechanism and life maps. The model accounts for variations intemperature, orientation, cyclic frequency and deformation rate, stress ratio, sustained-load holdtimes, environment, and interactions resulting from complex load histories (i.e., highand low-cycle fatigue, creep-fatigue and thermal-mechanical fatigue). Georgia Tech PD: R. W. Neu ([email protected])GEPS Task Technical Lead: David Helmick ([email protected])APPENDIX D
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