STP1425: Application of Multiaxial Fatigue Parameters to Fretting Contacts with High Stress Gradients

    Nowell, D
    University of Oxford, Oxford,

    Araújo, JA
    University of Oxford, Oxford,

    Pages: 12    Published: Jan 2003


    Abstract

    Many practical fretting contacts give rise to high stress concentrations or singularities that cause high stress gradients. Straightforward application of initiation-based life prediction methods can result in conservative life predictions as the high stress levels are not sustained over a critical volume. This paper uses experimental results that show a size effect with the Hertzian contact geometry to investigate the application of Smith, Watson, Topper, and Fatemi-Socie multiaxial initiation parameters to fretting fatigue. It is concluded that, for cases where a high stress gradient exists, an averaging procedure is required in order to produce an acceptable prediction of initiation life. This approach is compared to an alternative procedure based on short crack arrest and the similarities and differences are discussed.

    Keywords:

    fretting fatigue, initiation, multiaxial parameters


    Paper ID: STP10756S

    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP10756S


    CrossRef ASTM International is a member of CrossRef.