TY - GEN
T1 - FORMULATION OF A CONTINUUM ANISOTROPIC MODEL FOR THE ANULUS FIBROSUS IN TENSION
AU - Elliott, Dawn M.
AU - LeRoux, Michelle A.
AU - Laursen, Tod A.
AU - Setton, Lori A.
N1 - Funding Information:
This work was supported with funds from the NSF (BES-9510401), the Whitaker Foundation, and training grants from NIH and NSF. FEAP was kindly provided by RE Taylor at UC Berkeley.
Publisher Copyright:
© 1997 American Society of Mechanical Engineers (ASME). All rights reserved.
PY - 1997
Y1 - 1997
N2 - The anulus fibrosus (AF) of the intervertebral disc is a highly structured material made up of alternating tissue layers (lamella) with collagen fibers oriented +30° and -30° to the circumferential axis (Figure 1). Collagen confers a high tensile stiffness to the AF which contributes to the load-bearing function of the intervertebral disc in vivo. In addition, the specialized organization of the AF gives rise to strongly anisotropic behaviors which may contribute to its mechanical function. Numerous models have been proposed for the material behavior of the AF including a fiber-reinforced composite or membrane, a layered transversely isotropic material, an orthotropic material, and a poroelastic isotropic material [6,8,9,12]. Fiber-reinforced models are complicated by the need to quantify the collagen content, the collagen and ground substance material properties, and associated fiber-matrix interactions. Continuum models of the AF are complicated by the need to determine a unique set of material properties which can require as many as 9 independent constants for a linear orthotropic material.
AB - The anulus fibrosus (AF) of the intervertebral disc is a highly structured material made up of alternating tissue layers (lamella) with collagen fibers oriented +30° and -30° to the circumferential axis (Figure 1). Collagen confers a high tensile stiffness to the AF which contributes to the load-bearing function of the intervertebral disc in vivo. In addition, the specialized organization of the AF gives rise to strongly anisotropic behaviors which may contribute to its mechanical function. Numerous models have been proposed for the material behavior of the AF including a fiber-reinforced composite or membrane, a layered transversely isotropic material, an orthotropic material, and a poroelastic isotropic material [6,8,9,12]. Fiber-reinforced models are complicated by the need to quantify the collagen content, the collagen and ground substance material properties, and associated fiber-matrix interactions. Continuum models of the AF are complicated by the need to determine a unique set of material properties which can require as many as 9 independent constants for a linear orthotropic material.
UR - http://www.scopus.com/inward/record.url?scp=85126913737&partnerID=8YFLogxK
U2 - 10.1115/IMECE1997-0280
DO - 10.1115/IMECE1997-0280
M3 - Conference contribution
AN - SCOPUS:85126913737
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
SP - 165
EP - 166
BT - Advances in Bioengineering
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 1997 International Mechanical Engineering Congress and Exposition, IMECE 1997 - Advances in Bioengineering
Y2 - 16 November 1997 through 21 November 1997
ER -