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Coupon scale Z-pinned IM7/8552 delamination tests under dynamic loading

Research output: Contribution to journalArticle

Original languageEnglish
Article number105565
Number of pages12
JournalComposites Part A: Applied Science and Manufacturing
Early online date1 Aug 2019
DateAccepted/In press - 31 Jul 2019
DateE-pub ahead of print - 1 Aug 2019
DatePublished (current) - 1 Oct 2019


Dynamic impact onto laminated composite structures can lead to large-scale delamination. This can be mitigated by the introduction of through-thickness reinforcement, such as z-pins. Here, mode I & II and mixed-mode delamination tests have been designed and conducted at high loading rate, for both unpinned and Z-pinned coupons to study the effect of rate of loading. It was found that the Z-pins were not effective in delaying the dynamic crack initiation or resisting the dynamic propagation of delaminations shorter than 5 mm. However, the further growth of cracks was substantially delayed by Z-pinning, especially for the pure mode I and mode I dominated failure modes. On the other hand, the effectiveness of Z-pins in shear tests was relatively modest. The mode I dominated delamination resistance of Z-pinned laminates was found to be sensitive to the loading rate.

    Research areas

  • Delamination, Fracture mechanics, Through-thickness reinforcement



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    Embargo ends: 1/08/20

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    Licence: CC BY-NC-ND


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