Abstract
In this study, we investigated the dynamic mechanical properties of polycarbonate materials, noncrystal polymeric materials in the low-cycle-fatigue region. The fundamental differences between metal and polycarbonate materials are in their stress-strain hysteresis loops. We payed our attention in the plastic energy, which is a common parameter of metal and polycarbonate materials, by measuring the area of the stress-strain hysteresis loop under constant strain control. As a result, we found that the expected fatigue failure takes place when the cumulative energy observed reaches a certain energy value Wf.
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