Fatigue of polymeric composites during stationary and non-stationary self-heating
Andrzej Katunin
Quarterly No. 1, 2018 pages 19-24
DOI:
keywords: fatigue, self-heating effect, degradation of composite structures, acoustic emission
abstract The self-heating effect occurring during the cyclic loading of materials that exhibit thermoviscoelastic properties, depending on the loading conditions, may develop according to two possible scenarios: stationary and non-stationary. Since stationary self-heating has not been not previously studied in terms of the criticality of the self-heating effect, it is essential to perform such a study to better understand the degradation processes in this scenario and to confront the results with the criticality of non-stationary self-heating. In the present study, the experimental results on fatigue testing following the stationary self-heating scenario are presented and discussed. In order to characterize the degradation process, both self-heating temperature distributions and their evolution as well as acoustic emission measured at various self-heating temperature ranges were analyzed. The obtained results allow the influence of the self-heating effect on the residual life of composite structures under the stationary self-heating scenario to be estimated.