Abstract
The vibration test of the rubber samples is performed with a forced resonance vibrator. The sample is circular cylinder (10φ×60), both edge planes of which are cemented to the platens. The variations of dynamic modulus Ed (appearent value) and internal friction ηω with the initial strain (0∼30% in tension side) are investigated under constant temperature, frequency and impressed force. The following results are obtained. 1. Both Ed and ηω decrease with the increase of initial strain. 2. However, the ratio ηω/Ed remains unaffected with the change in initial strain. 3. The ratio of the static modulus to Ed is independent of the initial strain. 4. The larger the stiffness of the sample, the larger the rate of the decrease of Ed to the increase of initial strain.
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