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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 tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.ORCID-id: 0000-0001-8050-2294
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Swerea SICOMP, Piteå, Sweden.ORCID-id: 0000-0001-5738-3207
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.ORCID-id: 0000-0001-9649-8621
Department of Chemistry, Materials and Chemical Engineering, Politecnico di Milano, Italy. The Research Hub by Electrolux Professional, Pordenone, Italy.
2018 (engelsk)Inngår i: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 52, nr 24, s. 3277-3288Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Sage Publications, 2018. Vol. 52, nr 24, s. 3277-3288
Emneord [en]
Degree of cure, nonlinearity, viscoplasticity, shear
HSV kategori
Forskningsprogram
Polymera kompositmaterial
Identifikatorer
URN: urn:nbn:se:ltu:diva-68328DOI: 10.1177/0021998318764275ISI: 000444976600001Scopus ID: 2-s2.0-85045240621OAI: oai:DiVA.org:ltu-68328DiVA, id: diva2:1197365
Merknad

Validerad;2018;Nivå 2;2018-10-10 (svasva)

Tilgjengelig fra: 2018-04-12 Laget: 2018-04-12 Sist oppdatert: 2019-03-27bibliografisk kontrollert

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