|SUBJECT:||M.S. Thesis Presentation|
|TIME:||Friday, February 21, 2014, 11:00 a.m.|
|PLACE:||Love Building, 210|
|TITLE:||Thermomechanical Fatigue of Mar-M247: Extension of a Unified Constitutive and Life Model to Higher Temperatures|
|COMMITTEE:||Dr. Richard W. Neu, Chair (ME/MSE)
Dr. David L. McDowell (ME/MSE)
Dr. Olivier N. Pierron (ME)
The goal of this work is to establish a life prediction methodology for thermomechanical loading of the Ni-base superalloy Mar-M247 over a larger temperature range than previous work. The work presented in this thesis extends the predictive capability of the Sehitoglu-Boismier unified thermo-viscoplasticity constitutive model and thermomechanical life model from a maximum temperature of 871C to a maximum temperature of 1038C. The constitutive model, which is suitable for predicting stress-strain history under thermomechanical loading, is adapted and calibrated using the response from isothermal cyclic experiments conducted at temperatures from 500C to 1038C at different strain rates with and without dwells.