Volume 9, Issue 3 (March 2012)

    Influence Analysis of Application-Specific Phenomena on the Creep-Fatigue Life of Turbine Housings of Turbochargers

    (Received 5 May 2011; accepted 13 December 2011)

    Published Online: 2012

    CODEN: JAIOAD

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    Abstract

    The turbine housing of a turbocharger is exposed to extensive cyclic thermo-mechanical loading. This leads to multiaxial stress states with local plastifications, so that the design of the turbine housing becomes a major challenge in ensuring the guaranteed lifetime in relation to the high-temperature behavior of the materials. In a first step, a phenomenological lifetime approach in conjunction with a constitutive material model applied in a preceding finite-element analysis was developed and validated for application on the casting materials Ni-resist D5S and vermicular cast iron GJV. The present study deals with the adaption for turbine housing design together with the more detailed analysis of application-specific phenomena to improve the description of both the deformation behavior and the creep-fatigue damage behavior. The influence of different strain rates, mean strain conditions, and aging has been evaluated. Moreover, a critical plane approach has been investigated to handle multiaxial stress and strain states. A more accurate damage ratio is derived by use of specimens subjected to characteristic thermo-mechanical load conditions, which leads to an improved estimation of the cycle number until crack initiation on critical component positions.


    Author Information:

    Laengler, F.
    BorgWarner Turbo Systems Engineering GmbH,

    Mao, T.
    Institute for Materials Science, Technical Univ. of Darmstadt,

    Scholz, A.
    Institute for Materials Science, Technical Univ. of Darmstadt,


    Stock #: JAI103945

    ISSN: 1546-962X

    DOI: 10.1520/JAI103945

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    Author
    Title Influence Analysis of Application-Specific Phenomena on the Creep-Fatigue Life of Turbine Housings of Turbochargers
    Symposium , 0000-00-00
    Committee E08