Experiments on the small-strain behaviour of crosslinked natural rubber: 1. Torsion |
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Authors: | GB McKenna LJ Zapas |
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Affiliation: | Polymer Science and Standards Division, National Bureau of Standards, Washington, DC 20234, USA |
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Abstract: | The torsional behaviour of 1, 3 and 5 phr peroxide crosslinked natural rubber has been characterized over a range of strains from near the undistorted state (γ ≈ 0.017) to γ ≈ 1.0. Isochronal measurements of both torque and normal force were used to calculate values of the derivatives of the strain energy function W with respect to the first and second stretch invariants I1 and I2. In the course of our work we found that, contrary to many reports in the literature, was affected significantly by the amount of crosslinking. Finally for the 1 phr peroxide crosslinked rubber it was found that, while ageing for 14 months at ambient conditions did not significantly affect the small-strain torsional modulus, , it did significantly affect the individual derivatives and . |
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Keywords: | Ageing normal force rubber small-strain strain energy function torsion |
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