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An augmented hybrid constitutive model for simulation of unloading and cyclic loading behavior of conventional and highly crosslinked UHMWPE

Paper ID Volume ID Publish Year Pages File Format Full-Text
13138 832 2004 8 PDF Available
Title
An augmented hybrid constitutive model for simulation of unloading and cyclic loading behavior of conventional and highly crosslinked UHMWPE
Abstract

Ultra-high molecular weight polyethylene (UHMWPE) is extensively used in total joint replacements. Wear, fatigue, and fracture have limited the longevity of UHMWPE components. For this reason, significant effort has been directed towards understanding the failure and wear mechanisms of UHMWPE, both at a micro-scale and a macro-scale, within the context of joint replacements. We have previously developed, calibrated, and validated a constitutive model for predicting the loading response of conventional and highly crosslinked UHMWPE under multiaxial loading conditions (Biomaterials 24 (2003) 1365). However, to simulate in vivo changes to orthopedic components, accurate simulation of unloading behavior is of equal importance to the loading phase of the duty cycle. Consequently, in this study we have focused on understanding and predicting the mechanical response of UHMWPE during uniaxial unloading. Specifically, we have augmented our previously developed constitutive model to also allow for accurate predictions of the unloading behavior of conventional and highly crosslinked UHMWPE during cyclic loading. It is shown that our augmented hybrid model accurately captures the experimentally observed characteristics, including uniaxial cyclic loading, large strain tension, rate-effects, and multiaxial deformation histories. The augmented hybrid constitutive model will be used as a critical building block in future studies of fatigue, failure, and wear of UHMWPE.

Keywords
Constitutive modeling; Ultra-high molecular weight polyethylene; UHMWPE; Hybrid model; FEM; Radiation crosslinking; Multiaxial mechanical behavior; Small punch test
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An augmented hybrid constitutive model for simulation of unloading and cyclic loading behavior of conventional and highly crosslinked UHMWPE
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 25, Issue 11, May 2004, Pages 2171–2178
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us