Delamination resistance of composites using inclined Z-pins

Beene M'Membe, Sam Gannon, Mehdi Yasaee, Stephen R Hallett, Ivana K Partridge

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

4 Citations (Scopus)
114 Downloads (Pure)


This study explores the behaviour of inclined Z-pins inserted in End Loaded Split (ELS) specimens at areal densities of 0.22% and 0.40%. The study has shown an increase in the fracture toughness when Z-pins are better aligned with the load vector (inclined) compared to the conventional, orthogonally inserted Z-pins. Brittle, catastrophic failure occurs when the inclined Z-pins are misaligned with the load vector. Given the difficulty in predicting localised load vectors in complex structures, specimens with ±θ configuration are tested and compared to conventional non-inclined Z-pin configurations. The results for the areal densities tested in this study show minimal differences in delamination resistance between the two configurations. However, there is some evidence to suggest that at high areal densities, the ±θ configuration is likely to produce higher GIIC values compared to the conventional non-inclined Z-pin configuration.
Original languageEnglish
Title of host publicationProceedings of the 20th International Conference on Composite Materials (ICCM20)
PublisherInternational Conference on Composite Materials, ICCM
Number of pages8
Publication statusPublished - 24 Jul 2015
Event20th International Conference on Composite Materials (ICCM20) - Copenhagen, Denmark
Duration: 19 Jul 201524 Jul 2015


Conference20th International Conference on Composite Materials (ICCM20)

Structured keywords

  • Composites UTC


  • Z-pins
  • Inclined Insertion
  • Fracture Toughness


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