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    Volume 6, Issue 2 (May 2017)

    Special Issue Paper

    Influence of Different Micro-Imprints to Fatigue Life of Components

    (Received 14 March 2016; accepted 25 August 2016)

    Published Online: 24 May 2017

    CODEN: MPCACD

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    Abstract

    To improve tribological properties of components, different kinds of textures are added to their surfaces. Although the added imprints or craters are only few tens of micrometers wide and a few micrometers deep, they form an initial crack from which a fatigue crack may propagate. In this article, a numerical approach for calculating the fatigue life of a body with present micro-imprints with standard finite-element software will be presented. The objective is to show how the imprint shape and its manufacturing process influences the fatigue life. The considered specimens are round bodies that were made from Boehler K890 microclean cold-working steel. Three shapes of the imprints are studied: the imprints produced by a Vickers pyramid and a Rockwell cone and a half-spherical crater void produced by a laser device. The flat-surface round body served as a reference. The imprint shape and its manufacturing process is also considered. For this reason, a simulation of impression of Vickers and Rockwell indenters is simulated first, which is followed by a numerical fatigue-life prediction. In this manner, the residual stresses from the imprinting process are considered during the fatigue-life prediction. For the laser-induced craters and the reference body, only the fatigue life is numerically predicted. Because the material inhomogeneities are much smaller than the geometrical ones, the calculated fatigue lives for different texturing represent the fatigue-life reduction caused by the applied textures. To validate the presented numerical approach, the calculated fatigue lives are compared to the experimentally determined.


    Author Information:

    Tomazincic, D.
    Univ. of Ljubljana, Faculty of Mechanical Engineering, Ljubljana,

    Sedlacek, M.
    Inst. of Metals and Technology, Ljubljana,

    Podgornik, B.
    Inst. of Metals and Technology, Ljubljana,

    Klemenc, J.
    Univ. of Ljubljana, Faculty of Mechanical Engineering, Ljubljana,


    Stock #: MPC20160024

    ISSN:2165-3992

    DOI: 10.1520/MPC20160024

    Author
    Title Influence of Different Micro-Imprints to Fatigue Life of Components
    Symposium ,
    Committee E08