3. Results and Discussion which the was held are 1, 1.05, 1.10, 1.15 and 1.20. Some of the results are shown in figures 4 through 7 and in figure 9. On each of the specimen, inflation tests at constant but five different axial stretch ratios, Ȝ, were performed. The inflation pressure was cycled between 0 to 200 mm Hg (approximately 26 kPa) eight times while the vein being held at constant length. In each of this test the deformation field, the applied negative of the radial component of the normal stress and the axial load applied to ensure that the length of the vein is constant are measured simultaneously for all the eight cycles of loading and unloading. The negative of the radial component of the normal stress at the inner surface of the vein is hence forth called as pressure here. The pressure was increased by infusing normal saline at a constant rate of 10 ml/hr. The pressure was decreased by withdrawing normal saline at the same constant rate. The five different stretch ratios at vein Figure 4: Plot of I C – 3 vs inflation pressure for GSV at constant axial stretch ratio, (a) Ȝ=1.0 (b) Ȝ=1.1 (c) Ȝ=1.2 1 Figure 5: Plot of I C – 3 vs inflation pressure for GSV at constant axial stretch ratio, (a) Ȝ=1.0 (b) Ȝ=1.1 (c) Ȝ=1.2 2 Figure 6: Plot of I C – 3 vs inflation pressure for GSV at constant axial stretch ratio, (a) Ȝ=1.0 (b) Ȝ=1.1 (c) Ȝ=1.2 3 xial load required to maintain a constant axial stretch ratio, (a) Ȝ=1.0 (b) Ȝ=1.1 (c Figure 7: Plot of A ) Ȝ=1.2 vs inflation pressure for GSV (Note that the scale of the y-axis is different in these figures) 83
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