| Abstract: | On the basis of an analysis of the fractographic data for two polymeric materials (polymethyl-methacrylate and polycaprolactam) it is shown that it is possible to differentiate the effects of local heating and structural changes at the end of the main crack on the reduced lifetime of polymers under cyclic as compared with static loading. A method is proposed for estimating the values of the local temperature and the structure-sensitive coefficient  in the cyclic lifetime equation.For communication 2 see 3].Ioffe Physicotechnical Institute, Academy of Sciences of the USSR, Leningrad. Translated from Mekhanika Polimerov, No. 5, pp. 869–874, September–October, 1971. |
