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Stress relaxation and strain recovery phenomena during curing and thermomechanical loading: Thermorheologically simple viscoelastic analysis
RISE - Research Institutes of Sweden (2017-2019), Material och produktion, SICOMP.ORCID-id: 0000-0001-5738-3207
RISE - Research Institutes of Sweden (2017-2019), Material och produktion, SICOMP.ORCID-id: 0000-0003-4100-1790
Luleå University of Technology, Sweden.
2019 (engelsk)Inngår i: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 53, nr 26-27, s. 3841-3859Artikkel i tidsskrift (Fagfellevurdert) 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. © The Author

sted, utgiver, år, opplag, sider
SAGE Publications Ltd , 2019. Vol. 53, nr 26-27, s. 3841-3859
Emneord [en]
Viscoelasticity, process simulation, stress relaxation, strain recovery, temperature and degree of cure
HSV kategori
Identifikatorer
URN: urn:nbn:se:ri:diva-38906DOI: 10.1177/0021998319848818Scopus ID: 2-s2.0-85065747166OAI: oai:DiVA.org:ri-38906DiVA, id: diva2:1319818
Merknad

Finansiär: Clean Sky 2 Joint Undertaking, European Union (EU), Horizon 2020, ProTHiC, 821019

Finansiär 2: Vinnova, HiSim 

Tilgjengelig fra: 2019-06-03 Laget: 2019-06-03 Sist oppdatert: 2023-05-16bibliografisk kontrollert

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Saseendran, SibinBerglund, Daniel

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