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Deformation of an artery under pressurized inflation. Photographs: a porcine carotid artery under zero pressure (P = 0 kPa) and internal pressure (P = 13.3 kPa) while its right end was closed and free to move. Graph: the axial stretch ratio (length change ratio) and circumferential stretch ratio (internal radius change ratio) plotted as functions of the luminal pressure. The solid lines are the fitting curves using the Fung three-dimensional (3D) strain energy function.
