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Prediction of multiaxial mechanical behavior for conventional and highly crosslinked UHMWPE using a hybrid constitutive model
Journal article   Peer reviewed

Prediction of multiaxial mechanical behavior for conventional and highly crosslinked UHMWPE using a hybrid constitutive model

J.S. Bergström, C.M. Rimnac and S.M. Kurtz
Biomaterials, v 24(8), pp 1365-1380
2003
DOI: https://doi.org/10.1016/S0142-9612(02)00514-8
PMID: 12527278
Featured in Collection :   UN Sustainable Development Goals @ Drexel

Abstract

Constitutive modeling FEM Hybrid model Multiaxial mechanical behavior Radiation crosslinking Small punch test UHMWPE Ultra-high molecular weight polyethylene
The development of theoretical failure, fatigue, and wear models for ultra-high molecular weight polyethylene (UHMWPE) used in joint replacements has been hindered by the lack of a validated constitutive model that can accurately predict large deformation mechanical behavior under clinically relevant, multiaxial loading conditions. Recently, a new Hybrid constitutive model for unirradiated UHMWPE was developed Bergström et al., (Biomaterials 23 (2002) 2329) based on a physics-motivated framework which incorporates the governing micro-mechanisms of polymers into an effective and accurate continuum representation. The goal of the present study was to compare the predictive capability of the new Hybrid model with the J 2-plasticity model for four conventional and highly crosslinked UHMWPE materials during multiaxial loading. After calibration under uniaxial loading, the predictive capabilities of the J 2-plasticity and Hybrid model were tested by comparing the load-displacement curves from experimental multiaxial (small punch) tests with simulated load-displacement curves calculated using a finite element model of the experimental apparatus. The quality of the model predictions was quantified using the coefficient of determination ( r 2). The results of the study demonstrate that the Hybrid model outperforms the J 2-plasticity model both for combined uniaxial tension and compression predictions and for simulating multiaxial large deformation mechanical behavior produced by the small punch test. The results further suggest that the parameters of the HM may be generalizable for a wide range of conventional, highly crosslinked, and thermally treated UHMWPE materials, based on the characterization of four material properties related to the elastic modulus, yield stress, rate of strain hardening, and locking stretch of the polymer chains. Most importantly, from a practical perspective, these four key material properties for the Hybrid constitutive model can be measured by relatively simple uniaxial tension or compression tests.

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Collaboration types
Industry collaboration
Domestic collaboration
Web of Science research areas
Engineering, Biomedical
Materials Science, Biomaterials
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