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

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)198-207
Number of pages10
JournalComposites Part A: Applied Science and Manufacturing
Early online date13 Apr 2017
DateAccepted/In press - 9 Apr 2017
DateE-pub ahead of print - 13 Apr 2017
DatePublished (current) - Aug 2017


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.

    Research areas

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

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    Accepted author manuscript, 1.45 MB, PDF document

    Licence: CC BY-NC-ND


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