STP1546

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

    Published: Jul 2012


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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.

    Keywords:

    turbine housing, finite-element analysis, elastoplasticity, thermo-mechanical fatigue, creep-fatigue life assessment, Ni-resist D5S


    Author Information:

    Laengler, F.
    BorgWarner Turbo Systems Engineering GmbH, Kirchheimbolanden,

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

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


    Paper ID: STP154620120011

    Committee/Subcommittee: E08.07

    DOI: 10.1520/STP154620120011


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