Experimental Investigation and Modeling of the Thermal Effect on the Mechanical Properties of Polyethylene-Terephthalate FRP Laminates
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 10
Abstract
Recent advancements in material sciences have led to the development of new fiber-reinforced polymer (FRP) systems that, unlike traditional FRPs, are specifically tailored to have large fracture strains that are advantageous for external strengthening applications. One such system is polyethylene terephthalate (PET) FRP, which can attain a nominal fracture strain of 7%. In this work, the mechanical properties of PET laminates were investigated when exposed to temperatures ranging from 25°C to 125°C. Test results indicate that PET-FRP exhibits a nonlinear stress-strain response that could be divided into three phases with three moduli (, , and ) and corresponding three tensile strengths (, , and ). The results also demonstrate how the aforementioned mechanical properties degrade around the glass transition temperature of the epoxy from so ft ening in the matrix. Interestingly, test results indicate that PETs exhibit an increase in rupture strain (from 9% to 14%) when the test temperature increases from 25°C to 125°C. To properly document these observations into design tools, temperature-dependent material models for moduli and tensile strengths are derived.
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Data Availability Statement
Some or all of the data, models, or code generated or used during the study are available from the corresponding author by request (stress-strain data, Poisson’s ratio data, proposed models, and damage initiation data).
Acknowledgments
The work in this paper was supported, in part, by the Open Access Program from the American University of Sharjah. This paper represents the opinions of the authors and does not mean to represent the position or opinions of the American University of Sharjah. The authors gratefully acknowledge the support of the American University of Sharjah for sponsoring this research project. The authors would also like to thank and acknowledge MAPEI for providing the epoxy, and MAEDAKOSEN for providing the PET fibers. Special thanks to Eng. Mustafa Elyoussef for his help and collaboration in conducting the experiments.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 10 • October 2020
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This work is made available under the terms of the Creative Commons Attribution 4.0 International license, https://creativecommons.org/licenses/by/4.0/.
History
Received: Dec 30, 2019
Accepted: Apr 7, 2020
Published online: Jul 29, 2020
Published in print: Oct 1, 2020
Discussion open until: Dec 29, 2020
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