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Dynamic inter-fibre failure of unidirectional composite laminates with through-thickness reinforcement

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)64-71
Number of pages8
JournalComposites Science and Technology
Volume176
Early online date3 Apr 2019
DOIs
DateAccepted/In press - 1 Apr 2019
DateE-pub ahead of print - 3 Apr 2019
DatePublished (current) - 26 May 2019

Abstract

Unidirectional composite laminates reinforced in the thickness direction with Z-pins are tested in tension and compression with different off-axis angles at high loading rate. A split Hopkinson bar setup and a high speed imaging system have been used for these dynamic tests. It is found that the inter-fibre strength was reduced by Z-pinning in tension and shear dominated failure modes, and the reduction from dynamic loading conditions is greater than that in quasi-static. However, the laminate strength was not significantly influenced by Z-pinning when loaded predominantly in compression. This difference was caused by the transition of failure mechanisms around Z-pins. The stiffness of the laminate was not affected by Z-pins at elevated strain rates, since the increased epoxy stiffness helped to make up for the stiffness loss due to reduced fibre volume fraction resulting from Z-pins.

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the accepted author manuscript (AAM). The final published version (version of record) is available online via Elsevier at https://doi.org/10.1016/j.compscitech.2019.04.004 . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1 MB, PDF-document

    Embargo ends: 3/04/20

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    Licence: CC BY-NC-ND

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