An evaluation of large diameter through-thickness metallic pins in composites

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dc.contributor.authorNeale, Geoffrey
dc.contributor.authorSaaran, Vinodhen
dc.contributor.authorDahale, Monali
dc.contributor.authorSkordos, Alexandros A.
dc.date.accessioned2024-03-27T10:45:20Z
dc.date.available2024-03-27T10:45:20Z
dc.date.issued2024-03-24
dc.description.abstractThere is increasing demand for functional through-thickness reinforcement (TTR) in composites using elements whose geometry exceeds limitations of existing TTR methods like tufting, stitching, and z-pinning. Recently, static insertion of large diameter TTR pins into heated prepreg stacks has proven a feasible and robust reinforcement process capable of providing accurate TTR element placement with low insertion forces and lower tow damage compared with existing methods for similar element sizes (>1mm diameter) like post-cure drilling. Local mechanical performance and failure mechanics of these pinned laminates are reported here. Laminates with a single statically inserted pins (1.2, 1.5, and 2.0 mm) can mostly retain their in-plane integrity alongside a local improvement in mode I delamination toughness in carbon fibre-benzoxazine laminates. Tensile strength is mostly unaffected by the pins resulting from delamination suppression, whereas there is up to a doubling of Young’s modulus. Compressive strength is significantly diminished (up to 42 %) in pinned laminates. Interlaminar toughness is improved, and peak toughness is pushed ahead of the crack as pin diameter increases. The lack of significant deterioration in in-plane tensile properties in pinned laminates produced using static insertion can expand the range and forms of materials that can be inserted compared to existing TTR.en_UK
dc.description.sponsorshipThis work was supported by the SEER project which has received funding from the European Union's Horizon 2020 research and innovation programme (Grant agreement 871875).en_UK
dc.identifier.citationNeale G, Saaran V, Dahale M, Skordos AA. (2024) An evaluation of large diameter through-thickness metallic pins in composites, Composite Structures, Volume 337, June 2024, Article Number 118066en_UK
dc.identifier.eissn1879-1085
dc.identifier.issn0263-8223
dc.identifier.urihttps://doi.org/10.1016/j.compstruct.2024.118066
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/21093
dc.language.isoen_UKen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectThrough-thickness reinforcementen_UK
dc.subjectCarbon fibreen_UK
dc.subjectBenzoxazineen_UK
dc.subjectDamage mechanicsen_UK
dc.subjectFinite element analysis (FEA)en_UK
dc.titleAn evaluation of large diameter through-thickness metallic pins in compositesen_UK
dc.typeArticleen_UK
dcterms.dateAccepted2024-03-21

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