Book Description

The objective of the analytical program, was to define the engine operating parameters that affect the low-cycle fatigue and creep damage of critical components of naval aircraft engines during fleet operations. The following major program tasks were performed leading to the selection of a suitable model for predicting cumulative engine damage: A typical naval attack mission profile was selected for engine-aircraft operation. Control studies were made to determine engine response to transient operation at various ambient conditions. Transient and steady-state temperature distributions were determined for the critical engine components. Combined thermal and centrifugal stress, or pressure-induced stresses and plastic strains, were determined. Using existing material properties, low-cycle fatigue life was determined for the critical components. An analytical model was defined that simulated component thermal and stress response to selected engine parameters to be used in computing damage. Engine parameters were defined that can be monitored for calculating component low-cycle fatigue damage. (Author).