Estimation of long-term creep behavior of polycarbonate by stress-time superposition and effects of physical aging

摘要

Long-term property estimation is required for the long-term load bearing applications of thermoplastics. In the present work, short-term creep behavior of commercial grade polycarbonate was evaluated using an in-house manufactured testing rig at various creep stress levels keeping the testing temperature constant. Creep curves were shifted with respect to the time scale and a Master curve was obtained using stress-time superposition principle. To assess the effects of physical aging on the creep behavior, various specimens with different aging histories were tested. It was observed that aging had an insignificant effect on the creep behavior of polycarbonate under the employed conditioning and testing conditions.