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Physical aging effect on viscoelastic behavior of polymers
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements. Materials Engineering Department, Federal University of Rio Grande do Sul, Porto Alegre, Brazil; Institute of Mechanics and Mechanical Engineering, Riga Technical University, Riga, Latvia.ORCID iD: 0000-0001-6457-4028
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-5210-4341
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-8676-8819
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-5948-7525
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2022 (English)In: Composites Part C: Open Access, ISSN 2666-6820, Vol. 7, article id 100223Article in journal (Refereed) Published
Abstract [en]

The effect of physical aging on the viscoelastic (VE) behavior of epoxy resin is investigated experimentally performing strain-controlled tests at various temperatures on specimens aged at different temperatures (TA) for different times (tA). The aging effect is analyzed using as a framework Schapery's type of thermo-aging-rheologically simple (T-A-R simple) VE model that contains aging-state and test-temperature dependent shift factor. Experiments show that in first approximation, the shift factor can be presented as the product of aging related shift factor aA and temperature related factor aT. It is found that for short aging times the change rate of the aging shift factor with tA does not depend on TA, whereas for long tA at high TA the rate increases. Shift factors alone are not able to explain differences in relaxation curves for almost “fully” aged specimens aged at different high TA, It is shown that a T-A-R complex VE model with two additional aging-dependent functions can describe the observed discrepancies.

Place, publisher, year, edition, pages
Elsevier, 2022. Vol. 7, article id 100223
Keywords [en]
Physical aging, Viscoelasticity, Shift factors, Numerical analysis
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials; Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-88621DOI: 10.1016/j.jcomc.2021.100223ISI: 000819159600009Scopus ID: 2-s2.0-85121922581OAI: oai:DiVA.org:ltu-88621DiVA, id: diva2:1623753
Note

Validerad;2022;Nivå 2;2022-01-01 (johcin)

Available from: 2021-12-30 Created: 2021-12-30 Last updated: 2023-09-06Bibliographically approved

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Nunes, StephanieJoffe, RobertsEmami, NazaninFernberg, PatrikSaseendran, SibinVarna, Janis

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