Stress-Strain Properties of Natural Rubber under Biaxial Strain

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Abstract
Tube‐shaped samples were stretched in a direction parallel to the tube axis and at the same time inflated to cause a tangential extension. In this way 600 percent axial and 300 percent tangential elongation could be attained simultaneously. The stresses were calculated from the pressure in the tube and the dynamometer readings. The results are plotted as axial stress‐strain curves at different tangential elongations ranging from 0–300 percent. The curve for a higher tangential elongation lies at higher stresses than that for a lower tangential elongation; the differences are however larger than the theory predicts. At 600 percent axial elongation stress relaxation was measured at different tangential elongations. It appears that the relaxation constant is independent of the tangential elongation.

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