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Pseudo-hyperelastic model of tendon hysteresis from adaptive recruitment of collagen type I fibrils

Paper ID Volume ID Publish Year Pages File Format Full-Text
10209 671 2008 7 PDF Available
Title
Pseudo-hyperelastic model of tendon hysteresis from adaptive recruitment of collagen type I fibrils
Abstract

Understanding the functional relationship between the viscoelasticity and the morphology of soft collagenous tissues is fundamental for many applications in bioengineering science. This work presents a pseudo-hyperelastic constitutive theory aiming at describing the time-dependant hysteretic response of tendons subjected to uniaxial tensile loads. A macroscopic tendon is modeled as a composite homogeneous tissue with the anisotropic reinforcement of collagen type I fibrils. The tissue microstructure is considered as an adaptive network of fibrillar units connected in temporary junctions. The processes of breakage and reformation of active fibrils are thermally activated, and are occurring at random times. An internal softening variable and a dissipation energy function account for the adaptive arrangement of the fibrillar network in the pseudo-hyperelastic model. Cyclic uniaxial tensile tests have been performed in vitro on porcine flexor digital tendons. The theoretical predictions fit accurately the experimental stress–strain data both for the loading and the unloading processes. The hysteresis behavior reflects the improvement in the efficiency and performance of the motion of the muscle-tendon unit at high strain rates. The results of the model demonstrate the microstructural importance of proteoglycans in determining the functional viscoelastic adaptability of the macroscopic tendon.

Keywords
Pseudo-hyperelasticity; Tendon replacements; Proteoglycans; Collagen cross-linking; Hysteresis; Tendon biomechanics
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Pseudo-hyperelastic model of tendon hysteresis from adaptive recruitment of collagen type I fibrils
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 29, Issue 6, February 2008, Pages 764–770
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us