Dynamic bridging mechanisms of through-thickness reinforced composite laminates in mixed mode delamination

Hao Cui*, Mehdi Yasaee, Stephen R. Hallett, Ivana K. Partridge, Giuliano Allegri, Nik Petrinic

*Corresponding author for this work

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

8 Citations (Scopus)
335 Downloads (Pure)

Abstract

Delamination resistance of composite laminates can be improved with through-thickness reinforcement such as Z-pinning. This paper characterises the bridging response of individual carbon fibre/BMI Z-pins in mixed mode delamination at high loading rate using a split Hopkinson bar system. The unstable failure process in quasi-static tests, was also captured with high sampling rate instruments to obtain the complete bridging response. The energy dissipation of the Z-pins were analysed, and it was found that the efficacy of Z-pinning in resisting delamination growth decreased with an increase in mixed mode ratio, with a transition from pull-out to pin rupture occurring. The Z-pin efficacy decreased with loading rate for all mode mix ratios, due to the changing in failure surface with loading rate and rate-dependent frictional sliding.

Original languageEnglish
Pages (from-to)24-33
Number of pages10
JournalComposites Part A: Applied Science and Manufacturing
Volume106
Early online date23 Nov 2017
DOIs
Publication statusPublished - 1 Mar 2018

Keywords

  • A. Fracture toughness
  • B. Failure
  • C. Delamination
  • D. 3-Dimensional reinforcement

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