Towards the Development of a Physics-Based Thermo-Mechanical Fatigue Life Prediction Model for a Single Crystalline Ni-Base Superalloy

    (Received 29 September 2013; accepted 25 February 2014)

    Published Online: 2014

    CODEN: MPCOAD

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    Abstract

    A long term effort has been underway to develop a mechanism-based model for life prediction under thermo-mechanical fatigue (TMF) cycling. A model has been developed which is based upon the impingement of slip bands upon oxidized regions and subsequent initiation of a crack due to stress concentration. The concept of an effective cycle temperature, T eff, and the dynamic nature of the material are critical components of the model and result in the ability to produce very accurate life predictions. It has also been shown that the model is capable of addressing complexities such as imposed high cycle fatigue (HCF) while still producing excellent agreement with the experiment. However, given the fact that this material is used for jet engine turbine blades and that such blades have cooling holes which act as notches, the next step in the development of this model is to incorporate it into a notched environment. The principal features of the TMF model are reviewed and a strategy for full integration into notched fatigue life prediction is discussed. Recent experimental results are presented which are based upon simulating smooth bar conditions at the notch root and a first approach to numerical simulation (called Q fit) is presented. Suggestions for further research are discussed.


    Author Information:

    Amaro, Robert L.
    George W. Woodruff School of Mechanical Engineering and Mechanical Properties Research Laboratory, Georgia Institute of TechnologyNIST, AtlantaBoulder, GeorgiaCO

    Antolovich, Stephen D.
    George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA

    School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA

    Neu, Richard W.
    George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA

    School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA

    Adair, Benjamin S.
    George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA

    Hirsch, Michael R.
    George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA

    Fernandez-Zelaia, Patxi
    George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA

    O'Rourke, Matthew
    George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA

    Staroselsky, Alexander
    United Technologies Research Center, East Hartford, CT


    Stock #: MPC20130049

    ISSN: 2165-3992

    DOI: 10.1520/MPC20130049

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    Author
    Title Towards the Development of a Physics-Based Thermo-Mechanical Fatigue Life Prediction Model for a Single Crystalline Ni-Base Superalloy
    Symposium , 0000-00-00
    Committee E08