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A parametric model has been developed to perform cycle by cycle crack propagation predictions for aero engine discs. The unknowns in the model were determined by extensive specimen testing.
A first model was developed to predict crack propagation. A comparison with the experimental data revealed that the inclusion of retardation effects was advisable.
Benefits include:
increased reliability in component life prediction;
increased flight safety;
reduced spare part cost.
A parametric model has been developed to perform cycle by cycle crack propagation predictions for aero engine disks. The unknowns in the model were determined by extensive specimen testing.
Several algorithms have been developed which account for part or all of the observed phenomena:
the Walker model for the R-dependence of crack propagation;
the Elber model for crack closure;
the Chaboche model for the elastoplastic behaviour and crack initiation;
the Paris and Forman Laws for crack propagation;
newly developed models to account for retardation due to cycle interaction.
The algorithms were validated using the complex cycle and disc spinning tests.
The implementation of these algorithms into life monitoring systems will lead to better life predictions and so result in an increase of safety and a more economical use of resources. Furthermore, the successful application of the potential drop (PD) technique to a disc spinning test will allow for a more accurate crack propagation tracking in real engine component tests.
The implementation of the algorithms into real time engine monitoring systems will reduce the uncertainty of component life prediction by a factor of 2, resulting in improved component reliability, and will support the introduction of damage tolerant lifing concepts.
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