Prediction of elastic properties of polyethylene terephthalate after biaxial elongation using a multiscale approach
Yun-Mei Luo, Luc Chevalier, Thanh Tung Nguyen
Abstract. Poly(ethylene terephthalate) (PET) is widely used in packaging due to its mechanical properties, which are closely linked to its microstructure. To better understand how PET crystallizes under stretching, we studied its behavior during biaxial tensile test near the glass transition temperature (Tg). A biaxial testing machine with heating system was developed to perform in-situ tests under a synchrotron beam. Small-angle X-ray scattering (SAXS) analysis was conducted under constant width (CW) and equal-biaxial (EB) loading conditions to examine macromolecular orientation and crystallization. A two-step homogenization approach was developed to estimate the elastic properties of stretched PET based on the observed microstructural changes. This study highlights the relationship between the microstructure and mechanical properties of PET, particularly the effects of strain-induced crystallization and molecular orientation. Additionally, a parametric uncertainty study on the elastic properties of the oriented amorphous phase was carried out to test the sensitivity of the elastic moduli. Monte Carlo simulations confirmed the convergence of the model, supporting the robustness of the predictions in terms of both means and standard deviation statistical data.
Keywords
Polyethylene Terephthalate (PET), Homogenization Process, Biaxial Stretching, SAXS Measurements
Published online 5/7/2025, 8 pages
Copyright © 2025 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: Yun-Mei Luo, Luc Chevalier, Thanh Tung Nguyen, Prediction of elastic properties of polyethylene terephthalate after biaxial elongation using a multiscale approach, Materials Research Proceedings, Vol. 54, pp 2265-2272, 2025
DOI: https://doi.org/10.21741/9781644903599-244
The article was published as article 244 of the book Material Forming
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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