Prediction of thermo-mechanical fatigue life of superalloy components
|GKN AEROSPACE SWEDEN AB - Volvo Aero Aktiebolag
|Funding from Vinnova
|SEK 2 000 000
|October 2010 - June 2013
Purpose and goal
The aim of the project is first to develop an efficient method to predict life of commercial aircraft engine subcomponents which are exposed to cyclic thermomechanical loads with hold time effects and secondly to determine material parameters for a selected superalloy. Material parameters for the superalloy Haynes 282 has been determined for rate independent plasticity and the experiments have been successfully modeled. Even cyclic softening could be captured. Methods for rate dependency and life prediction will be studied in the project continuation within NFFP6.
Results and expected effects
The expected result is that GKN will have efficient methods to determine the response and life in commercial aircraft engine subcomponents. The identified methods for rate independent plasticity except for cyclic softening are available at GKN but since the experiments on Haynes 282 have been made on test specimens with another heat treatment than prescribed by GKN, the results have not been used yet.
Approach and implementation
The thought is to use available methods as much as possible and develop them if necessary to capture certain phenomena. A tight cooperation with the syster project is foreseen. The studied phenomena within rate-independent plasticity could be modeled accurately enough with available methods. These methods are however not always available in commercial FE-codes. The tight cooperation with the syster project has been rewarding. Due to problems with the test equipment and test specimens, the material modeling project has come ahead of the test project which is not optimal.