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Application of the polynomial chaos expansion to approximate the homogenised response of the intervertebral disc

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Abstract

A possibility to simulate the mechanical behaviour of the human spine is given by modelling the stiffer structures, i.e. the vertebrae, as a discrete multi-body system (MBS), whereas the softer connecting tissue, i.e. the softer intervertebral discs (IVD), is represented in a continuum-mechanical sense using the finite-element method (FEM). From a modelling point of view, the mechanical behaviour of the IVD can be included into the MBS in two different ways. They can either be computed online in a so-called co-simulation of a MBS and a FEM or offline in a pre-computation step, where a representation of the discrete mechanical response of the IVD needs to be defined in terms of the applied degrees of freedom (DOF) of the MBS. For both methods, an appropriate homogenisation step needs to be applied to obtain the discrete mechanical response of the IVD, i.e. the resulting forces and moments. The goal of this paper was to present an efficient method to approximate the mechanical response of an IVD in an offline computation. In a previous paper (Karajan et al. in Biomech Model Mechanobiol 12(3):453–466, 2012), it was proven that a cubic polynomial for the homogenised forces and moments of the FE model is a suitable choice to approximate the purely elastic response as a coupled function of the DOF of the MBS. In this contribution, the polynomial chaos expansion (PCE) is applied to generate these high-dimensional polynomials. Following this, the main challenge is to determine suitable deformation states of the IVD for pre-computation, such that the polynomials can be constructed with high accuracy and low numerical cost. For the sake of a simple verification, the coupling method and the PCE are applied to the same simplified motion segment of the spine as was used in the previous paper, i.e. two cylindrical vertebrae and a cylindrical IVD in between. In a next step, the loading rates are included as variables in the polynomial response functions to account for a more realistic response of the overall viscoelastic intervertebral disc. Herein, an additive split into elastic and inelastic contributions to the homogenised forces and moments is applied.

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Acknowledgments

The authors would like to thank the German Research Foundation (DFG) for financial support of the project within the Cluster of Excellence in Simulation Technology (EXC 310/1) at the University of Stuttgart.

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Authors and Affiliations

  1. Institute of Applied Mechanics (Civil Engineering), University of Stuttgart, Pfaffenwaldring 7, Stuttgart, 70569, Germany

    N. Karajan, D. Otto & W. Ehlers

  2. Institute of Hydraulic Engineering (LH2), University of Stuttgart, Pfaffenwaldring 61, Stuttgart, 70569, Germany

    S. Oladyshkin

  3. Cluster of Excellence for Simulation Technology (SimTech), University of Stuttgart, Pfaffenwaldring 5a, Stuttgart, 70569, Germany

    N. Karajan, D. Otto, S. Oladyshkin & W. Ehlers

  4. DYNAmore GmbH, Gesellschaft für FEM Ingenieurdienstleistungen, Headquarters, Industriestr. 2, Stuttgart, 70565, Germany

    N. Karajan

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  1. N. Karajan
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Correspondence to N. Karajan.

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Karajan, N., Otto, D., Oladyshkin, S. et al. Application of the polynomial chaos expansion to approximate the homogenised response of the intervertebral disc. Biomech Model Mechanobiol 13, 1065–1080 (2014). https://doi.org/10.1007/s10237-014-0555-y

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