Ductility of platelet composites inspired by nacre design

Anil R. Ravindran, Raj B. Ladani, Shuying Wu, Adrian P. Mouritz, Chun H. Wang

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

Abstract

Platelet composite design inspired by nacre microstructure has attracted wide interest as a means to improvinge toughness of materials. Presented within this paper are novel approaches in to _engendering simultaneous improvements to the pseudo-ductility and strength improvement simultaneously inof discontinuous fibre reinforced epoxy composites. The approaches were finger-type ply overlapping, discontinuous platelets and z-pin reinforcement of joints. A comparative numerical and experimental study is described in this paper to identify the relationship between ply-overlap length and strain ductility of a platelet composite design with z-pin reinforcement. Larger The results show that a carbon fibre epoxy platelet composite ply overlap length is can _found to retain 45% and 93%, respectively, of the tensile strength and failure strain of the continuous fibre composite counterpart. A relatively small pseudo-ductility strain of 1.07% was observed. Analytical modelling studies towards these were conducted on platelet or discontinuous fibre reinforced epoxy composites withof platelet composites of varying aspect ratios and tiling configurations_. Results suggest that the staggering of the neighbouring ply terminations resulted in an increased tensile strength whereas aligning the ply-termination for each second consecutive ply leads to the increase in strain-to-failure. The incorporation of z-pin reinforcements (stainless steel, copper and carbon fibre/BMI) through-the-thickness of the platelet composite was investigated. The shear-induced work hardening of the metal pins further enhances the pseudo-ductile strain and strength simultaneously; supplementing the shear lag process between the ply overlaps.

Original languageEnglish
Title of host publicationProceedings of the ICCM21, Xi'an, August 20-25th 2017
PublisherInternational Committee on Composite Materials (ICCM)
Number of pages9
Publication statusPublished - 2017
Externally publishedYes
EventInternational Conference on Composite Materials (21st : 2017) - Xi'an, China
Duration: 20 Aug 201725 Aug 2017

Conference

ConferenceInternational Conference on Composite Materials (21st : 2017)
Abbreviated titleICCM21
CountryChina
CityXi'an
Period20/08/1725/08/17

Keywords

  • Carbon fibre
  • nacre-mimetics
  • pseudo-ductility
  • tensile strength
  • z-pins

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  • Cite this

    Ravindran, A. R., Ladani, R. B., Wu, S., Mouritz, A. P., & Wang, C. H. (2017). Ductility of platelet composites inspired by nacre design. In Proceedings of the ICCM21, Xi'an, August 20-25th 2017 International Committee on Composite Materials (ICCM).