Title

Nonlinear Viscoelastic Material Property Estimation of Lower Extremity Residual Limb Tissues

Document Type

Article

Language

eng

Format of Original

12 p.

Publication Date

4-2004

Publisher

American Society of Mechanical Engineers

Source Publication

Journal of Biomechanical Engineering

Source ISSN

0148-0731

Original Item ID

doi: 10.1115/1.1695575

Abstract

Axisymmetric nonlinear finite-element analysis was used to simulate force-relaxation and creep data obtained during in vivo indentation of the residual limb soft tissues of six individuals with trans-tibial amputation [1]. The finite-element models facilitated estimation of an appropriate set of nonlinear viscoelastic material coefficients of extended James-Green-Simpson material formulation for bulk soft tissue at discrete, clinically relevant test locations. The results indicate that over 90% of the experimental data can be simulated using the two-term viscoelastic Prony series extension of James-Green-Simpson material formulation. This phenomenological material formulation could not, however, predict the creep response from relaxation experiments, nor the relaxation response from creep experiments [2–5]. The estimated material coefficients varied with test location and subject indicating that these coefficients cannot be readily extrapolated to other sites or individuals.

Comments

Journal of Biomechanical Engineering, Vol. 126, No. 2 (April 2004): 289-300. DOI.