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TECHNICAL BRIEFS

A Quasi-Linear, Viscoelastic, Structural Model of the Plantar Soft Tissue With Frequency-Sensitive Damping Properties

[+] Author and Article Information
William R. Ledoux

Department of Veterans Affairs, RR&D Center for Excellence in Limb Loss Prevention and Prosthetic Engineering, VA Puget Sound Health Care System, Seattle WA, 98108Department of Mechanical Engineering and Department of Orthopaedics and Sports Medicine, University of Washington, Seattle, WA, 98195

David F. Meaney

Department of Bioengineering, University of Pennsylvania, Philadelphia, PA 19104

Howard J. Hillstrom

Gait Study Center, Temple University School of Medicine, Philadelphia, PA 19107

J Biomech Eng 126(6), 831-837 (Feb 04, 2005) (7 pages) doi:10.1115/1.1824133 History: Received March 07, 2003; Revised July 02, 2004; Online February 04, 2005
Copyright © 2004 by ASME
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Figures

Grahic Jump Location
A schematic of the testing apparatus and the mechanical input data input. In the schematic, the foot is viewed posteriorly. Note that the dorsal surface of the foot is placed into the PMMA. The graph is the input displacement for the experiment, including the haversines of increasing amplitude (0 to 5 s), the preconditioning (5 to 35 s), the delay period (35 to 195 s), and the ramp and hold (195 s to 375 s). Note that the x axis was not drawn proportionally.
Grahic Jump Location
The average stress relaxation (normalized force vs time) data (±1 S.D.) and the fit generated from the average QLV coefficients for the subcalcaneal, five submetarsal, and subhallucal areas
Grahic Jump Location
The average stress relaxation (unnormalized force vs time) data (±1 S.D.) and the fit generated from the average QLV coefficients for the subcalcaneal, five submetarsal, and subhallucal areas. BW=body weight.

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