Abstract
The experimental points on Fig. 1 of part 1 lie between the curves obtained from equns. 25 and 27. Eqn. 25 is expected to be the most accurate theoretical pressure-radius relationship. Eqn. 27 is the simplified form of this relationship obtained by taking the limit of zero thickness and applying a constant zero deformation, thickness factor. The two equations differ by about 10%. For somewhat different conditions,Gent andRivlin (1952) compared theory and experiment for a rubber tube and found agreement within a small experimental error. Rivlin's theory and experiment relate to a rubber tube which is isotropic. The experimental points in Fig. 1 of part 1 have been obtained from a rubber tube for which the circumferential Young's modulus was 8% smaller than the longitudinal value. The value ofE used in the reduction of experimental results is an effective value based on shell theory. This value is 10% lower than the longitudinal value ofE.
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