Journal of Mechanical Science and Technology

  • 제17권9호
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  • Pages.1332-1338
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  • 2003
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  • 1738-494X(pISSN)
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  • 1976-3824(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지

Dynamic Compressive Creep of Extruded Ultra-High Molecular Weight Polyethylene

  • Lee, Kwon-Yong (Department of Mechanical Engineering, Bioengineering Research Center, Sejogn University) ;
  • David Pienkowski (Division of Orthopaedic Surgery, University of Kentucky) ;
  • Lee, Sungjae (Department of Biomedical Engineering, Inje University)
  • 발행 : 2003.09.01
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초록

To estimate the true wear rate of polyethylene acetabular cups used in total hip arthroplasty, the dynamic compressive creep deformation of ultra-high molecular weight polyethylene (UHMWPE) was quantified as a function of time, load amplitude, and radial location of the specimen in the extruded rod stock. These data were also compared with the creep behavior of polyethylene observed under static loading. Total creep strains under dynamic loading were only 64％, 70％, and 61％ of the total creep strains under static loading at the same maximum pressures of 2 MPa,4 MPa, and 8 MPa, respectively. Specimens cut from the periphery of the rod stock demonstrated more creep than those cut from the center when they were compressed in a direction parallel to the extrusion direction (vertical loading) whereas the opposite was observed when specimens were compressed in a direction perpendicular to the extrusion direction (transverse loading). These findings show that creep deformation of UHMWPE depends upon the orientation of the crystalline lamellae.

키워드

참고문헌

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