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Effect of degree of cure on viscoplastic shear strain development in layers of [45/−45]s glass fibre/ epoxy resin composites
Luleå University of Technology, Sweden.
RISE - Research Institutes of Sweden, Swerea, Swerea SICOMP AB. Luleå University of Technology, Sweden.
Luleå University of Technology, Sweden.
The Research Hub by Electrolux Professional, Italy; Politecnico di Milano, Italy.
2018 (Engelska)Ingår i: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 52, nr 24, s. 3277-3288Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Effect of degree of cure on irreversible (viscoplastic) shear strain development in layers of glass fibre/ epoxy resin (LY5052 epoxy resin) [+45 °/−45 °]s laminate is studied performing a sequence of constant stress creep and viscoelastic strain recovery tests. For fixed values of degree of cure in range from 79.7% to 100%, the viscoplastic strains were measured as dependent on time and stress and Zapa's integral representation was used to characterize the observed behaviour. It is shown that at all degrees of cure the viscoplastic behaviour can be described by Zapa's model with parameters dependent on degree of cure. It is shown that for degree of cure lower than 80% the viscoplastic strains grow much faster and are much more sensitive to the increase of the applied shear stress. These irreversible strains developing in the final phase of the curing can significantly alter the residual stress state in the composite structure.

Ort, förlag, år, upplaga, sidor
2018. Vol. 52, nr 24, s. 3277-3288
Nyckelord [en]
Degree of cure, nonlinearity, shear, viscoplasticity, Curing, Glass fibers, Shear flow, Shear strain, Shear stress, Shearing, Epoxy resin composites, Integral representation, Irreversible strain, Residual stress state, Viscoelastic strain, Viscoplastic strains, Epoxy resins
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Naturvetenskap
Identifikatorer
URN: urn:nbn:se:ri:diva-34552DOI: 10.1177/0021998318764275Scopus ID: 2-s2.0-85045240621OAI: oai:DiVA.org:ri-34552DiVA, id: diva2:1237548
Tillgänglig från: 2018-08-09 Skapad: 2018-08-09 Senast uppdaterad: 2018-12-12Bibliografiskt granskad

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