Derivation of Myocardial Fiber Stiffness Equation Based on Theory of Laminated Composite

[+] Author and Article Information
Y. C. Pao, G. K. Nagendra

Department of Engineering Mechanics, University of Nebraska, Lincoln, Neb. 68588

R. Padiyar, E. L. Ritman

Biodynamics Research Unit, Department of Physiology and Biophysics, Mayo Clinic, Mayo Foundation, Rochester, Minn. 55901

J Biomech Eng 102(3), 252-257 (Aug 01, 1980) (6 pages) doi:10.1115/1.3149582 History: Received October 29, 1979; Revised May 20, 1980; Online June 15, 2009


The constitutive equation with stress-dependent coefficients for laminated composite is derived and employed for iterative determination of myocardial fiber’s stiffness equation Ef = Kσf + C from myocardial strip’s stiffness equation Es = Ks σs + Cs . The strip’s stiffness constants Ks and Cs 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.

Copyright © 1980 by ASME
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