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Analysis of non-linear shear stress-strain response of unidirectional GF/EP composite
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-9649-8621
2014 (English)In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 62, p. 67-76Article in journal (Refereed) Published
Abstract [en]

Reasons for nonlinear stress-strain curves in shear of unidirectional glass fibre composite are analysed. Laminate with stacking sequence [45/-45]s is used in tensile quasi-static as well as in tensile creep and strain recovery tests to study the development of viscoelastic and viscoplastic shear strains in local coordinates of the ply. It is shown that Zapa’s integral representation of viscoplasticity is applicable for this material and methodology for parameter determination is given. Schapery’s nonlinear viscoelastic material model was used for shear response characterization and the nonlinearity parameters’ dependence on the shear stress was determined and described by fitting functions. Microdamage development is quantified by measuring axial modulus and Poisson’s ratio of the laminate. The obtained nonlinear viscoelastic, viscoplastic model with included effect of microdamage was successfully used to predict the nonlinear shear stress-strain curve in strain controlled tensile loading.

Place, publisher, year, edition, pages
2014. Vol. 62, p. 67-76
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-4069DOI: 10.1016/j.compositesa.2014.03.009ISI: 000337936600010Scopus ID: 2-s2.0-84899521795Local ID: 1ee10280-45a4-49f1-9a53-f1e98891a58dOAI: oai:DiVA.org:ltu-4069DiVA, id: diva2:976931
Note
Validerad; 2014; 20140317 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Giannadakis, KonstantinosVarna, Janis

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