Volume 3, Issue 5 (May 2006)

    Application of Low Plasticity Burnishing (LPB) to Improve the Fatigue Performance of Ti-6Al-4V Femoral Hip Stems

    (Received 7 October 2005; accepted 30 January 2006)

    CODEN: JAIOAD

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    Abstract

    Low plasticity burnishing (LPB) is a surface enhancement method that produces a deep layer of compressive residual stress with minimal cold working and an improved surface finish. Extensive fatigue testing, performed on numerous metal alloys in simulated environmental conditions, demonstrates that LPB significantly improves fatigue strength of highly stressed components. LPB is a flexible process, capable of being implemented on a wide variety of CNC machine tools. A product-specific LPB process was developed and applied to the modular neck taper junction of a Ti-6Al-4V total hip prosthesis (THP). LPB produced a compressive residual stress field with an improved surface finish, which enhanced component fatigue strength and resistance to fretting damage. X-ray diffraction (XRD) residual stress measurements, made before and after LPB application, are shown. High cycle fatigue (HCF) results obtained on LPB-processed hip stems are shown along with baseline data for unprocessed hip stems. HCF tests demonstrate complete elimination of fretting fatigue failures in the LPB processed area of the taper junction and a substantial increase in overall THP fatigue strength.


    Author Information:

    Hornbach, DJ
    Vice President and Director of Laboratory Operations, Lambda Technologies,

    Prevey, PS
    President and Director of Research, Lambda Technologies,

    Loftus, EF
    Senior Product Development Engineer, Exactech,


    Stock #: JAI13580

    ISSN: 1546-962X

    DOI: 10.1520/JAI13580

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    Author
    Title Application of Low Plasticity Burnishing (LPB) to Improve the Fatigue Performance of Ti-6Al-4V Femoral Hip Stems
    Symposium Fatigue and Fracture of Medical Metallic Materials and Devices, 2005-11-11
    Committee E08