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Curvature of unsymmetric cross-ply laminates: Combined effect of thermal stresses, microcracking, viscoplastic and viscoelastic strains
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-9649-8621
Luleå teknika universitet.
Luleå tekniska universitet.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Number of Authors: 4
2017 (English)In: Journal of reinforced plastics and composites (Print), ISSN 0731-6844, E-ISSN 1530-7964, Vol. 36, no 4, 283-293 p.Article in journal (Refereed) Published
Abstract [en]

Curvature of unsymmetrical [0/90] specimens caused by thermal stresses changes if the specimen is subjected to large axial strains introducing intralaminar cracks in the 90-layer. It is shown that the large curvature reduction can not be explained by cracking related stress release only. The large irreversible viscoplastic strains introduced during the axial tensile loading (with 5 min holding at high strain for crack counting) give the main contribution to the curvature change. The effect of transient viscoelasticity (VE) was found to be of minor significance. Simple approach based on effective damaged layer stiffness and constant irreversible strain is used in the framework of laminate theory to extract the viscoplastic and VE strains from experimental curvature data. The obtained fitting expressions for viscoplastic- and VE-strain development are successfully used to describe curvature change in [0/902] laminate subjected to the same test procedure. It is suggested that the used curved beam tests could be efficient to characterize the viscoplastic strain development in the thin 90-layers

Place, publisher, year, edition, pages
2017. Vol. 36, no 4, 283-293 p.
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-62009DOI: 10.1177/0731684416683027ISI: 000400151800004Scopus ID: 2-s2.0-85011591456OAI: oai:DiVA.org:ltu-62009DiVA: diva2:1074239
Note

Validerad; 2017; Nivå 2; 2017-02-15 (andbra)

Available from: 2017-02-15 Created: 2017-02-15 Last updated: 2017-11-24Bibliographically approved

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Varna, JanisHajlane, Abdelghani

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