Bridging mechanisms of through-thickness reinforcement in dynamic mode I&II delamination

Hao Cui, Mehdi Yasaee, Gordon Kalwak, Antonio Pellegrino, Ivana K Partridge, Stephen R Hallett, Giuliano Allegri, Nik Petrinic

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

20 Citations (Scopus)
221 Downloads (Pure)


Z-pin through-thickness reinforcement is used to improve the impact resistance of composite structures; however, the effect of loading rate on Z-pin behaviour is not well understood. The dynamic response of Z-pins in mode I and II delamination of quasi-isotropic IM7/8552 laminates was characterized experimentally in this work. Z-pinned samples were loaded at both quasi-static and dynamic rates, up to a separation velocity of 12m/s. The efficiency of Z-pins in mode I delamination decreased with loading rate, which was mainly due to the change in the pin misalignment, the failure surface morphology and to inertia. The Z-pins failed at small displacements in the mode II loading experiments, resulting in much lower energy dissipation in comparison with the mode I case. The total energy dissipation decreased with increasing loading rate, while enhanced interfacial friction due to failed pins may be largely responsible for the higher energy dissipation in quasi-static experiments.
Original languageEnglish
Pages (from-to)198-207
Number of pages10
JournalComposites Part A: Applied Science and Manufacturing
Early online date13 Apr 2017
Publication statusPublished - Aug 2017


  • Z-pin
  • mode I
  • mode II
  • delamination
  • dynamic


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