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TECHNICAL PAPERS

An Improved Method to Analyze the Stress Relaxation of Ligaments Following a Finite Ramp Time Based on the Quasi-Linear Viscoelastic Theory

[+] Author and Article Information
Steven D. Abramowitch, Savio L.-Y. Woo

Musculoskeletal Research Center, Department of Orthopaedic Surgery, Department of Bioengineering, University of Pittsburgh, E1641 Biomedical Science Tower, 210 Lothrop Street, P.O. BOX 71199, Pittsburgh, PA 15213 Phone: 412-648-2000 FAX: 412-648-2001e-mail: ddecenzo@pitt.edu

J Biomech Eng 126(1), 92-97 (Mar 09, 2004) (6 pages) doi:10.1115/1.1645528 History: Received April 02, 2003; Revised October 02, 2003; Online March 09, 2004
Copyright © 2004 by ASME
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References

Figures

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A typical residual plot demonstrating systematic deviations of the model and experimental data
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A typical random error plot with distribution 0±0.00874 (mean±SD)
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A typical curve fit using the strain history approach to experimental data (γ=0.15%/s during ramping)
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The reduced relaxation function as determined using the instantaneous assumption approach and the strain history approach
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Prediction of the peak stresses of a cyclic loading history based on the constants obtained from the stress relaxation experiment using the strain history approach for individual specimens (a) best prediction; (b) worst prediction

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