Abstract
The present study involves experiments and modelling aimed at characterizing the passive structural mechanical behavior of the chronic hypoxic lamb thoracic aorta, whose gestation, birth and postnatal period were carried at high altitude (3600 masl). To this end, the mechanical response was studied via tensile and pressurization tests. The tensile and pressurization tests measurements were used simultaneously to calibrate the material parameters of the Gasser–Holzapfel–Ogden (GHO) hyperelasctic anisotropic constitutive model through an analytical-numerical optimization procedure solved with an evolutionary strategy that guarantees a stable response of the model. The model and procedure of calibration adequately adjust to the material behavior in a wide deformation range with an appropriate physical description. The results of this study predict the mechanical response of the lamb thoracic aorta under generalized loading states like those that can occur in physiological conditions and/or in systemic arterial hypertension. Finally, the novel use of the evolutionary strategy, together with the set of experiments and tools used in this study, provide a robust alternative to validate biomechanical characterizations.
Highlights
The present study involves experiments and modelling aimed at characterizing the passive structural mechanical behavior of the chronic hypoxic lamb thoracic aorta, whose gestation, birth and postnatal period were carried at high altitude (3600 masl)
We present the Gasser–Holzapfel–Ogden (GHO) hyperelastic anisotropic constitutive model used for the mechanical characterization whose set of parameters was calibrated simultaneously from the tensile and pressurization tests measurements using an evolutionary strategy which is an algorithm oriented to global optimization
The experimental work, the modeling and the numerical simulations based on the uniaxial tensil and pressurization tests on aorta artery samples have been presented
Summary
The present study involves experiments and modelling aimed at characterizing the passive structural mechanical behavior of the chronic hypoxic lamb thoracic aorta, whose gestation, birth and postnatal period were carried at high altitude (3600 masl). To this end, the mechanical response was studied via tensile and pressurization tests. The most common cardiovascular complications are pulmonary arterial hypertension of the newborns (PAHN) and right ventricular remodelling These conditions are associated with physiological changes and structural alterations of the blood vessels such as an increased reactivity and r emodeling[3,4,5,6], involving geometric changes in the structure of the arterial walls[4,7,8,9].
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