Time, temperature and frequency viscoelastic behavior of commercial polymers

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.

Name thesis:degree_name

MS

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Mechanical and Aerospace Engineering

Year dc:date.available

2003

Author dc:creator

• Julius, Michael John

Contributors dc:contributor

• Ever J. Barbero
• Jacky C. Prucz

• Mechanical engineering
• Civil engineering

Identifier

https://researchrepository.wvu.edu/etd/1324

OAI identifier oai:identifier

oai:researchrepository.wvu.edu:etd-2327