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 . 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.
Nonlinear Viscoelastic Material Property Estimation of Lower Extremity Residual Limb Tissues
Contributed by the Bioengineering Division for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received by the Bioengineering Division July 10, 2003; revision received October 29, 2003. Associate Editor: J. D. Humphrey.
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To¨nu¨k, E., and Silver-Thorn, M. B. (May 4, 2004). "Nonlinear Viscoelastic Material Property Estimation of Lower Extremity Residual Limb Tissues ." ASME. J Biomech Eng. April 2004; 126(2): 289–300. https://doi.org/10.1115/1.1695575
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