A turbine blade is modeled as a rotating pretwisted beam and subjected to aerodynamic excitation from the flow path interference. The resonant stresses are determined using a modal analysis. With the help of steady steam bending and centrifugal stresses and the dynamic stresses, life estimates are made using the linear and nonlinear cumulative damage theories and a comparison of the results is presented. Based on these results, recommendations are made on the usefulness of different theories for practical application.
Issue Section:
Gas Turbines: Structures and Dynamics
Keywords:
turbines,
fatigue,
failure (mechanical),
rotors,
stress effects,
vibrations,
aerodynamics,
damping,
life testing
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Copyright © 2001
by ASME
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