STRESS-STRAIN BEHAVIOR OF IRRADIATED POLYURETHANE ELASTOMERS
GENERAL DYNAMICS CORP FORT WORTH TX
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The applicability of the Martin-Roth-Stiehler stress-strain relationship to a number of reactor-irradiated gamma-ray dose D range O - 1. 9 x 10 to the 10th power ergsgram in carbon polyurethane elastomers was demonstrated. For each level of dose and irradiation temperature, the stress- strain values showed remarkably good agreement with the behavior predicted by this relationship, thus permitting a realistic characterization of the stress- strain curves up to extension ratios of 3 by two parameters the tangent modulus E sub o and a coefficient K. While the available data did not justify conclusive inferences regarding the explicit nature of the functions E sub o D and KD, it appears from this analysis that E sub o varies exponentially with dose D and that K is a slowly varying function of dose.
- Elastomers and Rubber