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TECHNICAL PAPERS: Bone/Orthopedic

Hydrostatic Pressurization and Depletion of Trapped Lubricant Pool During Creep Contact of a Rippled Indenter Against a Biphasic Articular Cartilage Layer

[+] Author and Article Information
Michael A. Soltz, Ines M. Basalo, Gerard A. Ateshian

Department of Mechanical Engineering, Columbia University, New York, NY 10027

J Biomech Eng 125(5), 585-593 (Oct 09, 2003) (9 pages) doi:10.1115/1.1610020 History: Received October 07, 2002; Revised March 28, 2003; Online October 09, 2003
Copyright © 2003 by ASME
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References

Figures

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(a) Geometry of the contact configuration for an impermeable indenter on a biphasic surface; (b) the region at the center of contact contains the trapped lubricant
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Total normal contact traction (a) for early time response (t=0.01 s); (b) an intermediate time when the pool of lubricant has collapsed (t=500 s); and (c) near equilibrium response (t=10,000 s). For this case W=0.5 kN/m,R=0.1 m, α=2.5 μm, and λ=500 μm.
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Normal fluid flux across the surface of the tissue. In the fluid pocket, the flow is into the tissue. At the periphery of the contact area, the flow is into the joint spacing for the above geometry. (Same parameters as in Fig. 2.)
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Interfacial fluid pressure, pa, and normal effective traction, ta, at several time points for the above geometry. (Same parameters as in Fig. 2.)
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Surface displacement for selected early times inside the ripple region for the above geometry
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Trapped lubricant volume (per unit depth) versus time for various radii. W=0.5 kN/m, α=2.5 μm, and λ=500 μm.
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Trapped lubricant volume (per unit depth) versus time for various applied loads. R=0.1 m, α=2.5 μm, and λ=500 μm.
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Trapped lubricant volume (per unit depth) versus time for various parameters α and λ, with W=0.5 kN/m and R=0.1 m
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Variation of the normal approach between surfaces with time. W=0.5 kN/m and R=0.1 m.
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Time-dependent fluid load support, Wp/W (×100%), for various ripple dimensions and for no ripple. W=0.5 kN/m,R=0.1 m.
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Simulated effective friction coefficient, μeff, for various ripple dimensions and for no ripple. W=0.5 kN/m,R=0.1 m.

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