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TECHNICAL PAPERS: Soft Tissue

A Comparison Between Mechano-Electrochemical and Biphasic Swelling Theories for Soft Hydrated Tissues

[+] Author and Article Information
W. Wilson, C. C. van Donkelaar, J. M. Huyghe

Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, P.O. Box 513, 5600 MB, The Netherlands

J Biomech Eng 127(1), 158-165 (Mar 08, 2005) (8 pages) doi:10.1115/1.1835361 History: Received December 02, 2003; Revised August 04, 2004; Online March 08, 2005
Copyright © 2005 by ASME
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References

Figures

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Schematic representation of a confined compression/free swelling test: (a) a cylindrical disc of tissue (thickness h), is placed inside a confined compression chamber with an impermeable piston on top and a permeable filter at the bottom. (b) At t=0 either a pressure P is applied to the piston (confined compression) or the external salt concentration is changed to c* (free swelling). At t=t* the external force is removed or the external salt concentration is returned to cext.
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Finite element mesh and boundary conditions of the 2D simulation
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Computed strain curves for the confined compression simulations of the reference case (the R2 values between the biphasic swelling and the mechano-electrochemical curves were 0.9571 and 0.9949 for the loading and unloading part, respectively)
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Computed strain curves for the 1D swelling experiments of the reference case (the R2 values between the biphasic swelling and the mechano-electrochemical curves were 0.9560 and 0.9487 for the swelling and shrinking part, respectively)
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Computed strain curves for the confined compression simulations of the reference case as a function of height at t=144 s
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Computed strain curves for the 1D swelling simulations of the reference case as a function of height at t=149 s
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The correlation between the biphasic swelling model and the mechano-electrochemical model during confined compression (R2=0.8828 for loading and 0.7702 for unloading curves)
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The correlation between the biphasic swelling model and the mechano-electrochemical model during 1D swelling (R2=0.98254)
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Computed displacement curves for the 2D simulation. ux and uy are the horizontal and vertical displacement of the top-right node of the model, respectively.

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