Influence of the Peening Intensity on the Fatigue Behavior of Shot Peened Titanium Components

    Volume 5, Issue 9 (October 2008)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 18 September 2008

    Page Count: 10


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

    Oberwinkler, B.
    Mechanical Engineering, University of Leoben, Leoben

    Gaenser, H.-P.
    Mechanical Engineering, University of Leoben, Leoben

    Stoschka, M.
    Mechanical Engineering, University of Leoben, Leoben

    (Received 8 November 2007; accepted 18 August 2008)

    Abstract

    Although mechanical surface treatments are commonly used in engineering practice for their beneficial effect on fatigue life, little quantitative data are available from published literature. This paper presents the first results of a long-term research program that aims to develop quantitative design guidelines for the influence of mechanical surface treatments on the fatigue life of structural lightweight components. To gain a detailed understanding of the effects of mechanical surface treatments on surface roughness, residual stress distribution, and resulting fatigue strength, extensive experimental work as well as accompanying fracture analyses have been performed. Four-point rotating bending tests and alternating torsional tests were performed on a Ti-6Al-4V titanium alloy. Both smooth and notched specimen geometries were investigated. The heat-treated and machined specimens were subjected to a shot peening process with varying shot intensities within the recommendations of the MIL-S-13165C and MIL-P-81985 specifications. It was observed that shot peening can result in both an improvement as well as a deterioration in fatigue strength, depending on the shot peening intensity and the type of loading. For the assessment of the fatigue failure mechanisms, detailed investigations of the surface layer were included in the research program.


    Paper ID: JAI101537

    DOI: 10.1520/JAI101537

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    Author
    Title Influence of the Peening Intensity on the Fatigue Behavior of Shot Peened Titanium Components
    Symposium Seventh International ASTM/ESIS Symposium on Fatigue and Fracture Mechanics (36th ASTM National Symposium on Fatigue and Fracture Mechanics), 2007-11-16
    Committee E08