STP1508

    Comparison of the Temperature and Pre-Aging Influences on the Low Cycle Fatigue and Thermo-Mechanical Fatigue Behavior of Copper Alloys (CuCoBe∕CuCo2Be)

    Published: Jan 2009


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    Abstract

    Typically thermo-mechanical fatigue (TMF) loaded components in power plants and steel works are made of copper alloys and are used in different applications (e.g. cooling systems in continuous casting, transformers). So a careful analysis and comparison of the experimental results and microstructure of thermo-mechanical loaded copper components, which are based on a systematic variation of the relevant influence factors, have been conducted to develop empirical models for computing the fatigue life. At specific low cycle fatigue (LCF) and thermo-mechanical fatigue test series on the copper alloys CuCoBe and CuCo2Be, the influence of pre-aging and temperature were investigated by means of the cyclic deformation and lifetime behavior. Based on stress-strain loops from LCF tests at different temperatures and aging conditions a non-linear combined material model was adopted to describe the cyclic deformation behavior. The simulated loading parameters of stress and strain were the basis for the subsequent lifetime simulation. A new energy based damage parameter for copper alloys has been developed to fulfill the requirements of lifetime simulation.

    Keywords:

    material model, energy based damage parameters, lifetime model


    Author Information:

    Koeberl, H.
    Chair of Mechanical Engineering, University of Leoben,

    Winter, G.
    University of Leoben,

    Leitner, H.
    Chair of Mechanical Engineering, University of Leoben,

    Eichlseder, W.
    Chair of Mechanical Engineering, University of Leoben,

    University of Leoben,


    Paper ID: STP48790S

    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP48790S


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