A novel, bioinspired, non-Newtonian energy absorption medium for the protection of composite laminates under Low Velocity Impact (LVI).

Research output: Chapter or section in a book/report/conference proceedingChapter in a published conference proceeding

2 Citations (SciVal)

Abstract

Sea cucumbers, marine animals members of the Echinoderms family, will react to an external stimulus by rapidly and reversibly increasing their skin stiffness in order to protect themselves [1-3]. This mechanism has been the source of inspiration for the development of a protective smart layer able to improve the impact resistance of Carbon Fibre Reinforced Polymer (CFRP) laminates. By exploiting a dynamic and autonomous phase transition, this novel, non-Newtonian medium acts as a protective layer on the surface of a laminate by changing its mechanical properties in response to an external stimulus, preventing impact damage such as delamination and microcracks. Low Velocity Impact (LVI) tests were employed at an energetic level of 15 J, to assess the energy absorption characteristics of the protective multi-layered coatings which were compared to an uncoated CFRP laminate. Results from LVI indicated that the proposed smart layers are able to modify the way the energy is distributed during the impact event, due to a dynamic transition between a viscous and rubbery phase of the embedded non-Newtonian material. These data were further confirmed by ultrasonic C-Scan analyses which showed an average reduction of 60% of the extent of the internal damage in comparison with the CFRPs laminates. These results demonstrate that the proposed medium possess unique energy absorption characteristics, thus providing an innovative solution for the protection of CFRP laminates in primary load-bearing applications where they might be subjected to out-of-plane impacts, such as in aerospace or railways components.

Original languageEnglish
Title of host publicationBioinspiration, Biomimetics, and Bioreplication XII
EditorsRaul J. Martin-Palma, Mato Knez, Akhlesh Lakhtakia
PublisherSPIE
VolumeXII
ISBN (Electronic)9781510649576
DOIs
Publication statusE-pub ahead of print - 20 Apr 2022
EventBioinspiration, Biomimetics, and Bioreplication XII 2022 - Virtual, Online
Duration: 4 Apr 202210 Apr 2022

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume12041
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceBioinspiration, Biomimetics, and Bioreplication XII 2022
CityVirtual, Online
Period4/04/2210/04/22

Bibliographical note

Funding Information:
The work in this publication was conducted under the project with title “Aegis, Advanced Energy-Absorption Polymer for Impact-Resistant Smart Composites” funded by the Engineering and Physical Sciences Research Council (EPSRC) [EP/T000074/1].

Keywords

  • Bioinspiration
  • CFRP
  • Impact Loading Resistance
  • Shear Stiffening Gel

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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