Abstract
Abstract Chemical stress relaxation of ethylene-propylene rubber under the combined environment of heat and radiation was studied. The temperature range is from 120 to 170°C, dose rate is from 2.2 × 104 R/h to 1.05 ×1 05 R/h. Decay curve were found to be Maxwellian over a period of time. A synergistic effect is found to exist in the stress decay of rubber under heat and radiation. The following equation expresses the rate of stress decay under heat and radiation K(r+h) = const. × I α exp (−E′/RT) + K(h) In the equation K(h) is the stress decay by heat alone, I is dose rate, α expresses the dose rate dependence (α=1.0 at 170°C), R is the gas constant, T is the temperature and E' is coefficient of synergism which is proposed in this paper.
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