Compressive stress relaxation behavior of irradiated ultra-high molecular weight polyethylene at 37°C

✍ Scribed by Stephen D. Waldman; J. Timothy Bryant

• Publisher: Wiley (John Wiley & Sons)
• Year: 1994
• Tongue: English
• Weight: 497 KB
• Volume: 5
• Category: Article
• ISSN: 1045-4861
• DOI: 10.1002/jab.770050408

✦ Synopsis

Abstract

The preconditioned stress relaxation behavior of irradiated ultra‐high molecular weight polyethylene (UHMWPE), a commonly used bearing surface in total joint replacements (TJR), was modelled in uniaxial compression at 37°C. Twenty cylindrical specimens (10 mm dia. × 27 mm length) were machined from a compression molded plate of medical grade UHMWPE and γ‐irradiated to a minimum dose of 2.5 Mrad. At an initial strain rate 1000%/s, five specimens were each tested at constant strains of 1, 2, 5 and 10%. The modified superposition principle provided a good agreement of the nonlinear viscoelastic (stress relaxation) behavior of UHMWPE (standard error of 0.0753 MPa). © 1994 John Wiley & Sons, Inc.