Thermal Mechanical Fatigue of Coated Blade Materials
Final rept. 1 Aug 1984-30 Sep 1988
PRATT AND WHITNEY WEST PALM BEACH FL ADVANCED ENGINEERING DIV
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A model capable of predicting thermal mechanical fatigue TMF crack initiation and propagation in coated advanced blade materials, with emphasis on crack initiation, was developed and demonstrated. The experimental program included isothermal baseline and TMF tests on one alloy and two coating materials to evaluate the effects of mean stress, frequency, hold periods, and maximum temperature on the TMF life of a coated system. Task I, Definition of TMF Conditions, was completed using the results of a separately funded program evaluating current and advanced airfoil conditions. Task II, AlloyCoating Selection and Isothermal Properties, generated monotonic data for uncoated PWA 1480, freestanding PWA 276 overlay coating, and PWA 275 aluminide coating.
- Jet and Gas Turbine Engines