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Stress relaxation and strain recovery phenomena during curing and thermomechanical loading: Thermorheologically simple viscoelastic analysis
RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
Luleå University of Technology, Sweden.
2019 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

Stress relaxation and strain recovery phenomena during curing and changed thermal conditions are analyzed using a viscoelastic model developed for thermorheologically complex materials (VisCoR). By making several simplifying assumptions regarding the material behavior, the incremental form of the VisCoR model is reformulated to a version describing thermorheologically simple material and presented in one-dimension for simplicity. The model (called VisCoR-simple) is used to analyze material behavior under various conditions, including stress relaxation behavior at varying temperatures and time scales; tensile loading and unloading tests at high temperatures; stress build up and “frozen-in” strains during curing and following cool-down and strain recovery during the next step of heating. Furthermore, the differences between the so-called “path-dependent” model, which is a linear elastic model with different elastic properties in glassy and rubbery regions, and the presented viscoelastic model are studied. The path-dependent model is an extreme case of the viscoelastic model presented. The importance of considering viscoelasticity when considering temperature and curing effects on polymers and the shortcomings of the path-dependent model are revealed and discussed. © The Author

Place, publisher, year, edition, pages
SAGE Publications Ltd , 2019.
Keywords [en]
process simulation, strain recovery, stress relaxation, temperature and degree of cure, Viscoelasticity, Curing, Recovery, Strain, Stress analysis, Unloading, Degree of cure, Process simulations, Simplifying assumptions, Stress relaxation behavior, Thermo-mechanical loading, Viscoelastic analysis, Viscoelastic modeling
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Natural Sciences
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URN: urn:nbn:se:ri:diva-38906DOI: 10.1177/0021998319848818Scopus ID: 2-s2.0-85065747166OAI: oai:DiVA.org:ri-38906DiVA, id: diva2:1319818
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Available from: 2019-06-03 Created: 2019-06-03 Last updated: 2019-06-03Bibliographically approved

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