. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 60 MARY REIDY HEBRANK allowed to compress or extend as necessary during the extension and compression of the longitudinal sides. The primary purpose of these biaxial stressing tests was to determine the relative contributions of the crossed-fiber system and the interfibrillar matrix material to the mechanical properties of the whole skin. If the extensibility of the skin is controlled solely by the helical fibers, the ratio of the hoop to longitudinal stresses applied is always equal to the tangent of the fiber angle resulti
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 60 MARY REIDY HEBRANK allowed to compress or extend as necessary during the extension and compression of the longitudinal sides. The primary purpose of these biaxial stressing tests was to determine the relative contributions of the crossed-fiber system and the interfibrillar matrix material to the mechanical properties of the whole skin. If the extensibility of the skin is controlled solely by the helical fibers, the ratio of the hoop to longitudinal stresses applied is always equal to the tangent of the fiber angle resulting from these stresses times the tangent of the initial fiber angle. Using this relationship a longitudinal stress-strain curve can be constructed for any constant hoop stress applied, that will predict skin properties if they are due only to a set of continuous fibers. Comparison with the experimentally obtained stress-strain curve for whole skin should allow the role of the inter- fibrillar matrix to be assessed. The secondary purpose of this experiment was to test for isotropy in the hoop and longitudinal directions predicted by a 45° fiber angle. To do so the experi- mental conditions were simply reversed and applied to previously untested samples, so that an increasing tensile stress was applied to the hoop axis while the longitudinal axis was maintained at a constant stress. Extensions of the skin during swimming. Stress-strain curves for the skin cannot be very meaningful to our understanding of fish locomotion unless we know where the range of in vivo stresses and strains falls on the experimentally determined stress-strain curves. For this reason extensions of the skin in the hoop and longitudinal directions were measured in the following way : An eel was anaesthetized by covering it with ice for 2 to 3 hr, then 4 stitches were sewn in the skin on the side of the animal with heavy white thread. The four knots thus made formed a rectangle centered over the lateral line
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
