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Viscoelastic and Failure Properties in Biaxial and Uniaxial Tensions. Part II.
Annual technical rept. 24 Aug 65-23 Aug 66,
STANFORD RESEARCH INST MENLO PARK CALIF
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An unfilled styrene-butadiene vulcanizate was studied under a biaxial tensile deformation essentially, pure shear by stretching thin-wall cylindrical specimens axially while internal gas pressure was controlled to maintain a constant outside diameter. Between 25 and 90 C, specimens were stretched at crosshead speeds between 0.02 and 20 inches per minute between -40 and 20 C, stress-relaxation measurements were made. A comparison of rupture data between 25 and 90 C in biaxial and uniaxial tension showed that the ultimate extension ratios in biaxial and uniaxial tension are sensibly identical at the same temperature and extension rate but that the uniaxial rupture stress lies between the axial and circumferential rupture stresses under the biaxial tensile conditions. A discussion is also given of the large deformation and ultimate properties of noncrystallizable vulcanizates in uniaxial tension and of the large deformation properties of a natural rubber vulcanizate.
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