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Derivation of myocardial fiber stiffness equation based on theory of laminated composite
Y C Pao1, G K Nagendra, R Padiyar
1Department of Engineering Mechanics, University of Nebraska, Lincoln, Neb. 68588, USA.
Abstract:
The constitutive equation with stress-dependent coefficients for laminated composite is derived and employed for iterative determination of myocardial fiber's stiffness equation E(f) = Ksigma(f) + C from myocardial strip's stiffness equation E(s) = K(s)sigma(s) + C(s). The strip's stiffness constants K(s) and C(s) are estimated by the least-square curve fitting of the stress-strain data experimentally obtained from uniaxially stretching of strips of left ventricular heart wall excised from seven canine hearts. The values of K and C computed at selected fiber orientations across the thickness of the strip and using three, five, and ten-layer approximations are reported.
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