Ductility and pseudo-ductility of thin ply angle-ply CFRP laminates under quasi-static cyclic loading

Jonathan Fuller*, Michael Wisnom

*Corresponding author for this work

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

11 Citations (Scopus)
326 Downloads (Pure)

Abstract

The quasi-static loading-unloading performance of thin ply carbon-epoxy [±265]s,[±275]s and [±265/0]s laminates is presented. Consistent experimental results allow the reduction in laminate modulus to be evaluated using three different methods: secant modulus of each loading cycle; a secant modulus up to a constant stress, and the initial tangent modulus of reloading. It is shown, via all three methods, that these layups can undergo multiple cyclic loadings and display excellent retention of stiffness. The [±265/0]s layup displays a limited modulus reduction, despite the gradual failure of the 0° layers. The [±θ5]s specimens do not display any decrease in initial modulus and effectively suppress damage accumulation (shown via X-ray CT imaging), which both suggest that the stress–strain behaviour of these layups is ductile, rather than pseudo-ductile.

Original languageEnglish
Pages (from-to)31-38
Number of pages8
JournalComposites Part A: Applied Science and Manufacturing
Volume107
Early online date21 Dec 2017
DOIs
Publication statusPublished - 1 Apr 2018

Keywords

  • A. Laminates
  • B. Plastic deformation
  • C. Laminate mechanics
  • D. Mechanical testing

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