. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 64 MARY REIDY HEBRANK -30. -20 10- 0 10 EXTENSION (°/o) FIGURE 4. Stress-strain curves for tests in which one side of the skin was held at a constant stress while the orthogonal side was subjected to an increasing tensile load. Closed circle, hoop direction pulled while longitudinal direction held at stress of MN/m2; open circle, longitudinal direction pulled while hoop direction held at stress of MN/m2. A theoretical curve for a pure fiber model subjected to the same ratio of forces is shown as a dashed line.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 64 MARY REIDY HEBRANK -30. -20 10- 0 10 EXTENSION (°/o) FIGURE 4. Stress-strain curves for tests in which one side of the skin was held at a constant stress while the orthogonal side was subjected to an increasing tensile load. Closed circle, hoop direction pulled while longitudinal direction held at stress of MN/m2; open circle, longitudinal direction pulled while hoop direction held at stress of MN/m2. A theoretical curve for a pure fiber model subjected to the same ratio of forces is shown as a dashed line. MN/m2 is shown in Figure 4. Also in this figure is a graph of a calculated curve, based on the continuous fiber model described previously, subjected to the same ratio of forces applied to the skin. It can be seen from these graphs that the crossed-fibers within the skin behave in a manner similar to the model except at the end points of the curves. In the range of ±10% extension, the elastic modulus of the eel skin was found to average MN/m2, while that of the model shown averages about MN/m2, an insignificant difference. The de- parture of the experimental curve from the model curve at the end points indicates that the matrix material, the interference between the helical and radial fibers, or some other feature of the skin may become a limiting factor at very high and low fiber angles, or that the density of fibers or their thickness may similarly impose limits to extension. When the experimental conditions were reversed and the longitudinal axis was maintained at a stress of MN/m2, the stress-strain curve for the hoop. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/0
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
