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http://dx.doi.org/10.3795/KSME-A.2011.35.6.619

A Study of Fiber-Reinforced Material Models for the Mechanical Characteristics of Human Annulus Fibrosus  

Lim, Jun-Taek (Dept. of Mechanical Engineering, Dankook Univ.)
Choi, Deok-Kee (Dept. of Mechanical Engineering, Dankook Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.35, no.6, 2011 , pp. 619-628 More about this Journal
Abstract
Human soft tissues, including muscles, ligaments, skin, and blood vessels, are an interesting subject because damage to them can be observed in everyday life. Besides the lack of available experimental data and the large deformation upon loading, the anisotropic and compressible nature of annulus fibrosus makes it more difficult to find a simple material model. A fiber-reinforced hyperelastic material model is used to determine the stress-strain curves upon uniaxial loading. The energy potential function for annulus fibrosus is composed of three different parts: matrix, fibers, and matrix-fiber interaction, which accounts for the angles between two families of fibers. In this paper, two different types of energy potential function for the matrix are considered, and are inserted into the fiber-reinforced model. The calculated results are compared with the Neo-Hookean model and experimental data, and reasonable agreement is observed overall.
Keywords
Soft Tissues; Annulus Fibrosus; Hyperelasticity; Energy Functions; Biomechanics; Large Deformation; Fiber-Reinforced Materials;
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