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Stress relaxation and strain recovery phenomena during curing and thermomechanical loading: Thermorheologically simple viscoelastic analysis
Materials and Production, RISE SICOMP AB, Sweden.
Materials and Production, RISE SICOMP AB, Sweden.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-9649-8621
2019 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 53, no 26-27, p. 3841-3859Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Sage Publications, 2019. Vol. 53, no 26-27, p. 3841-3859
Keywords [en]
Viscoelasticity, process simulation, stress relaxation, strain recovery, temperature and degree of cure
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-74974DOI: 10.1177/0021998319848818ISI: 000485295700015Scopus ID: 2-s2.0-85065747166OAI: oai:DiVA.org:ltu-74974DiVA, id: diva2:1330389
Note

Validerad;2019;Nivå 2;2019-10-00 (johcin)

Available from: 2019-06-25 Created: 2019-06-25 Last updated: 2019-10-04

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Berglund, DanielVarna, Janis

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