A Study on the Low-Cycle-Fatigue Behavior of Polycarbonate Material. Relationship between Fatigue Life and Energy Loss.

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.