Mechanical Characterization of PMMA Acrylic Bone Cements with a Nonlinear Viscoelastic Model

Abstract

A nonlinear analytical viscoelastic model is proposed for time-dependent mechanical characterization of PMMA bone cements. A pseudo-Burger rheological model is presented and its characterization is discussed, containing instantaneous, retarded and long time viscous effects with nonlinear dependence of stress. The proposed model is fitted to available creep data of commercial PMMA bone cements. The obtained results show that the proposed model can be used to predict time-dependent creep effects of PMMA bone cements for different stress levels, thus providing an accurate description of the experimental data together with relevant mechanical interpretation.