Abstract
This chapter concerns the response of polymer systems subjected to combined static and cyclic loads. It investigates the effects of mean stresses, stress amplitudes, frequencies, and temperature on the creep behavior of Nylon 6/6 and polyvinylidene fluoride (PVDF). The study is based on a systematic experimental program involving stress–strain tests, creep tests, vibrocreep tests and postcyclic stress strain tests. The results of the investigation demonstrate that under cyclic loading conditions, both the polymers exhibit accelerated creep rates. This phenomenon has been observed even in the range of stresses well below the visco-elastic linearity limit. It is shown that the vibrocreep behavior of the polymers is essentially nonlinear, as their response to superimposed sustained and cyclic loads does not represent a simple superposition of the responses to static and fully reversed cyclic loads applied separately.
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