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Swing Phase Lubrication Analysis of a Novel Artificial Hip Joint

[+] Author Affiliations
S. Boedo, S. A. Coots

Rochester Institute of Technology, Rochester, NY

J. F. Booker

Cornell University, Ithaca, NY

Paper No. IMECE2013-64356, pp. V03AT03A067; 7 pages
doi:10.1115/IMECE2013-64356
From:
  • ASME 2013 International Mechanical Engineering Congress and Exposition
  • Volume 3A: Biomedical and Biotechnology Engineering
  • San Diego, California, USA, November 15–21, 2013
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5621-5
  • Copyright © 2013 by ASME

abstract

This paper investigates swing-phase cavitation formation and collapse in a novel artificial hip joint using a well-established transient mass-conserving finite element cavitation algorithm. Elastic elements and ellipsoidal cup surface geometry are incorporated into the new design to promote and enhance ‘squeeze-film’ action over ‘wedge-film’ action employed in conventional artificial hip joints. During the swing phase of the gait cycle, the lubricant film undergoes cavitation from normal separation of ball and cup surfaces. Reformation of a complete lubricant film is predicted over a wide range of sub-ambient cavitation threshold pressures, ball velocities, ellipticity specifications, and ball initial positions that are likely to be encountered in practice.

Copyright © 2013 by ASME

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