Accession Number : AD0284915

Title :   ULTIMATE AND PSEUDO-EQUILIBRIUM TENSILE PROPERTIES OF IRRADIATED ELASTOMERS

Corporate Author : GENERAL DYNAMICS/FORT WORTH TEX

Personal Author(s) : FRITZ,E.G. ; JOHNSON,P.M.

Report Date : AUG 1962

Pagination or Media Count : 1

Abstract : IT IS SHOWN THAT THE PSEUDO-EQUILIBRIUM STRESSSTRAIN BEHAVIOR AND ULTIMATE STRENGTH OF A NUMBER OF COMMERCIALLY PREPARED AND REACTOR-IRRADIATED VU CANIZATES (silicones, polyurethanes, natural rubber, NR-neoprene, and NR-SBR blends) follow, in good approximation, the empirically developed relationship tau/(2(alpha-alpha to the minus 2nd power)) equals CD to the A power, where tau is the stress or ultimate tensile strength in psi (with reference to the undeformed cross section) at extension ratio alpha, D is the absorbed dose in megarads, and C and A are constants. In the cases investigated, A varied from near zero to 0.5. This relationship is compared with a similar expression developed by Charlesby et al (The Rheology of Elastomers, pp. 129-149, Pergamon Press, 1958), and with the Andrade creep function. (Author)

Descriptors :   *ELASTOMERS, *VULCANIZATES, MECHANICAL PROPERTIES, POLYMERS, RADIATION EFFECTS, RUBBER, SILICONES, STRESSES, SYNTHETIC RUBBER, UREIDO ( N-C( O)-N

Distribution Statement : APPROVED FOR PUBLIC RELEASE