Time-Dependent Mechanical Behavior of Sheep Digital Tendons, Including the Effects of Preconditioning

[+] Author and Article Information
A. Sverdlik, Y. Lanir

Department of Biomedical Engineering, Technion—Israel Institute of Technology, Haifa 32000, Israel

J Biomech Eng 124(1), 78-84 (Sep 17, 2001) (7 pages) doi:10.1115/1.1427699 History: Received July 25, 2000; Revised September 17, 2001
Copyright © 2002 by ASME
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The test protocol of a single set (A) and for the entire test sequence (B). (Note: The loading and unloading slopes in A are not in scale.) The duration of phases in A are: first relaxation—10 min, multiple (10) steps—1 min each, second relaxation—10 min (except at set 5 in which it was 30 min). The strain levels in B: set 1–4 percent, set 2–6 percent, set 3–8 percent, set 4–7 percent, set 5–6 percent.
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The stress-strain curves for the first and last stretches of each set (sample 11-15/7/99). Symbols: the reference strain esmin for set 2 (#), set 3 (*) and set 4 (+). In set 5, esmin cannot usually be determined reliably due to high noise/signal ratio resulting from the very low force signals at these sets.
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Typical measured stress response (light gray) of one sample (No. 7–15/7/99), and comparison with the model prediction based on the entire data( lower dark line), and with the model prediction based only on data of sets 1,2,3,5( upper gray line). In sets 1,2,3,5 the two lines are indistinguishable since they nearly overlap.
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Comparison between simulation and experimental data of the stress-strain curves in the first stretch in each loading set (Sample 11–15/7/99). Gray line—experimental data, dark line—model prediction.




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