Scaling effects in notched composites

M. R. Wisnom*, S. R. Hallett, C. Soutis

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

147 Citations (Scopus)
704 Downloads (Pure)


A program of scaled tests on unnotched and open-hole tension and compression specimens is summarized. Quasi-isotropic IM7/8552 carbon-fiber epoxy specimens have been tested using two different scaling techniques: sub-laminate-level ([45/90/ - 45/0]ns) and ply-level scaling ([45n/90 n/ - 45n/0n]s), independently varying the thickness and in-plane dimensions. Significant scaling effects are shown, with both strength and failure mechanisms changing with specimen size and the thickness scaling method having a particularly important effect. Failure mechanisms and scaling behavior are compared between tension and compression and models presented that predict the observed size effects from fundamental material parameters without any fitting factors.
Original languageEnglish
Pages (from-to)195-210
Number of pages16
JournalJournal of Composite Materials
Issue number2
Publication statusPublished - Jan 2010


  • Notched strength
  • Open hole
  • Scaling
  • Size effects


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