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TECHNICAL PAPERS: Soft Tissue

Nonlinear Viscoelastic Material Property Estimation of Lower Extremity Residual Limb Tissues

[+] Author and Article Information
Ergin Tönük

Middle East Technical University, Department of Mechanical Engineering, TR-06531 Ankara-Turkeye-mail: tonuk@metu.edu.tr

M. Barbara Silver-Thorn

Marquette University, Department of Biomedical Engineering, 1515 West Wisconsin Avenue, Milwaukee, Wisconsin 53233e-mail: B.Silver-Thorn@Marquette.edu

J Biomech Eng 126(2), 289-300 (May 04, 2004) (12 pages) doi:10.1115/1.1695575 History: Received July 10, 2003; Revised October 29, 2003; Online May 04, 2004
Copyright © 2004 by ASME
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References

Figures

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Relaxation simulation with creep-based time-dependent and relaxation-based elastic material coefficient estimates (“creep time dependent coefficients”), and creep-based time-dependent and elastic material coefficient estimates (“creep material coefficients”) (a). Creep simulation with relaxation-based time-dependent and creep-based material coefficient estimates (“relaxation time dependent coefficients”), and relaxation-based time-dependent and elastic material coefficient estimates (“relaxation material coefficients”) (b)
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Distribution of the non-dimensional ratio of the nonlinear elastic material coefficient, C̃i, (a), and the time-dependent material coefficient estimates, δ̃j, (b), τ̃j, (c)
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One-dimensional mechanical representation of the generalized Kelvin-Voigt linear viscoelastic material model (F=generalized force, d=generalized displacement, ki=generalized spring constant, and ci=generalized viscous damper coefficient)
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Experimental force and displacement (Subject 6, proximal popliteal area; gray lines) during relaxation (a) and creep (b) and regressed Prony series models (black lines)
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Experimental setup (left) and finite element simulation (right) of the indentation experiment
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Soft tissue elastic material coefficients (bars) and normalized sum of square error, NSSEi (crosses), during elastic material coefficient estimation during initial loading of relaxation (Subject 6, proximal popliteal area) (a). Also shown is the experimental and simulated relaxation response during the viscoelastic coefficient search process (b)
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Soft tissue elastic material coefficients (bars) and normalized sum of square error, NSSEi (crosses), during elastic material coefficient estimation during initial loading of creep (Subject 6, proximal popliteal area) (a). Also shown is the simulation of soft tissue creep during viscoelastic material coefficient estimation (b). Finally, the elastic material coefficients (bars) and NSSEi (crosses), during refinement of the elastic material coefficients (c) are shown, as are the final viscoelastic material coefficients (d)

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