Mechanics of Time-Dependent Materials

, Volume 12, Issue 3, pp 189–203

Impact of time-dependency on long-term material testing and modeling of polyethylene

Article

DOI: 10.1007/s11043-008-9056-7

Cite this article as:
Bischoff, J.E. Mech Time-Depend Mater (2008) 12: 189. doi:10.1007/s11043-008-9056-7

Abstract

Ultra-high molecular weight polyethylene (UHMWPE) has an important role in orthopaedic implants because of its favorable properties as an articulating surface. UHMWPE component testing often focuses on measuring the long-term fatigue or wear response of the material that could be realized during many years of use. However, the impact of time-dependent properties of UHMWPE on such tests is not well characterized. In particular, altering the frequency of loading and allowing for material creep or relaxation can significantly alter the stress/strain state of the material, and therefore affect long-term mechanical properties (e.g. wear, fatigue) that are dependent on the constitutive state. The goal of this work is to use advanced, validated material modeling of UHMPWE that incorporates time-dependent properties to explore the effects of frequency and rest time on the mechanical response of UHMWPE.

Keywords

UHMWPE Viscoplastic Compression Fatigue Creep Polyethylene 

Copyright information

© Springer Science+Business Media, B. V. 2008

Authors and Affiliations

  1. 1.Zimmer, Inc.WarsawUSA

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