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Bearing strength performance of mixed thin/thick-ply, quasi-isotropic composite laminates
RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.ORCID iD: 0000-0001-6559-7694
KTH Royal Institute of Technology, Sweden.
RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites. Linköping University, Sweden.ORCID iD: 0000-0003-4472-1742
RUAG Space, Sweden.
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2021 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 261, article id 113312Article in journal (Refereed) Published
Abstract [en]

The effect of using thin plies to increase the bearing strength of composite laminates has been investigated. A series of 5 laminates of theoretically identical stiffness with varying proportions of thin plies were manufactured using a single material system. Four specimens from each plate were tested for bearing strength and damage was subsequently characterized using an optical microscope. The results show that performance in terms of bearing stiffness, strength at onset of damage, and ultimate bearing stress increase proportionally with the increasing amount of thin plies within the stack. Shifting from a 100% conventional ply laminate to a 100% thin-ply laminate gave an increase of 47% in the strength at onset of damage. Placement of the thin plies within the stack was also shown to be important for strength at initial onset of damage. Microscopic examination of the failure modes for all samples showed fiber kinking, localized to the center of the hole, to be the dominant failure mode regardless of the stacking sequence. © 2020 The Authors

Place, publisher, year, edition, pages
Elsevier Ltd , 2021. Vol. 261, article id 113312
Keywords [en]
Bearing strength, Composite failure, Thin ply, Stiffness, Bearing stiffness, Bearing strengths, Bearing stress, Composite laminate, Fiber-kinking, Material systems, Quasi-isotropic, Stacking sequence, Laminated composites
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-51468DOI: 10.1016/j.compstruct.2020.113312Scopus ID: 2-s2.0-85097745471OAI: oai:DiVA.org:ri-51468DiVA, id: diva2:1516305
Available from: 2021-01-11 Created: 2021-01-11 Last updated: 2021-06-21Bibliographically approved

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Cameron, ChristopherLoukil, Mohamed

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