Journal
JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME
Volume 128, Issue 5, Pages 742-750Publisher
ASME-AMER SOC MECHANICAL ENG
DOI: 10.1115/1.2244576
Keywords
parameter estimation; myocardium; orthotropic
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The study of ventricular mechanics-analyzing the distribution of strain and stress in myocardium throughout the cardiac cycle-is crucially dependent on the accuracy of the constitutive law chosen to represent the highly nonlinear and anisotropic properties of passive cardiac muscle. A number of such laws have been proposed and fitted to experimental measurements of stress-strain behavior. Here we examine five of these laws and compare them on the basis of (i) goodness of fit: How well they fit a set of six shear deformation tests, (ii) determinability: How well determined the objective function is at the optimal parameter fit, and (iii) variability: How well determined the material parameters are over the range of experiments. These criteria are utilized to discuss the advantages and disadvantages of the constitutive laws.
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