Most soft tissues that are treated clinically via heating experience multiaxial states of stress and strain in vivo and are subject to complex constraints during treatment. Remarkably, however, there are no prior data on changes in the multiaxial mechanical behavior of a collagenous tissue subjected to isometric constraints during heating. This paper presents the first biaxial stress-stretch data on a collagenous membrane (epicardium) before and after heating while subjected to various biaxial isometric constraints. It was found that isometric heating does not allow the increase in stiffness at low strains that occurs following isotonic heating. Moreover, increasing the degree of stretch prior to heating increased the thermal stability of the tissue consistent with the concept that mechanical loading primarily affects the activation entropy, not the activation energy.
Altered Mechanical Behavior of Epicardium Under Isothermal Biaxial Loading
Contributed by the Bioengineering Division for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received by the Bioengineering Division December 19, 2003; revision received March 22, 2004. Associate Editor: A. D. McCulloch.
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Wells , P. B., Harris , J. L., and Humphrey, J. D. (September 27, 2004). "Altered Mechanical Behavior of Epicardium Under Isothermal Biaxial Loading ." ASME. J Biomech Eng. August 2004; 126(4): 492–497. https://doi.org/10.1115/1.1785807
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