Abstract
Since collagen dominates the mechanical properties of the aorta in a high-pressure region, its intramural structure may determine the strength of the aorta. This may be particular important when studying rupture of the aortic aneurysms. It has been reported that considerable heterogeneity in stress and strain exists in elastic lamellas of the aorta [Matsumoto, 2008]. Such heterogeneity may exist in collagen, and have significant effects on rupture properties of the aneurysms. In this study, we stretched thin slices of the porcine thoracic aortas biaxially under a microscope to investigate the relationship between local strains and microscopic structures of collagen visualized with a pol-scope system (Abrio-LS, CRi) [Oldenbourg, 1996], which enables us to obtain a relative amount of collagen fibers [Sugita, 2011] and their dominant angle as magnitude of retardance and azimuth of birefringent material, respectively.
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