Date of Graduation
Statler College of Engineering and Mineral Resources
Mechanical and Aerospace Engineering
Ever J. Barbero
Jacky C. Prucz
This work involves an experimental investigation of creep behavior of commercial polymers used as encased liners in deteriorated sewer pipelines with emphasis on characterizing the effects of physical aging, temperature, and frequency. The procedure for finding the shift rate, mu, is based on Struik's protocol. Time-temperature superposition (TTSP) of short-term data, at different temperatures, was done. Effective Time Theory (ETT) is used to find the effective time, lambda, as a function of real time, t, from the master curve obtained by TTSP. Dynamic Mechanical Analysis (DMA) tests were done to get complex relaxation modulus, E*(o), as a function of frequency. Frequency Temperature Superposition (FTSP) was done to extend the frequency range. Mathematical transformations from the frequency domain to the time domain were done using a proposed empirical equation and data was compared to the TTSP data.
Julius, Michael John, "Time, temperature and frequency viscoelastic behavior of commercial polymers" (2003). Graduate Theses, Dissertations, and Problem Reports. 1324.