Suppressing Delamination through Vertically Aligned Carbon - - PowerPoint PPT Presentation

Suppressing Delamination through Vertically Aligned Carbon Nanotubes (VACNTs)

Robert Worboys, Ian Hamerton, Stephen Hallett, Rob Backhouse, Luiz Kawashita

16 April 2019

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Outline

• VACNTs Background
• Fracture Toughness Enhancement
• Mode I and Mode II
• Ply-Drop Strength Enhancement
• Summary and Future Work

Delamination Suppression through VACNTs

3 Delamination Suppression through VACNTs

VACNTs Background

Delamination VACNT Film CNT Micro- buckling

4 Delamination Suppression through VACNTs

Fracture Toughness Enhancement

MODE I - DCB MODE II - ELS

5 Delamination Suppression through VACNTs

Ply Drop Strength Enhancement

6 Delamination Suppression through VACNTs

Ply Drop Strength Enhancement

BASELINE 11μm VACNTs Interleave 40μm VACNTs Interleave

7 Delamination Suppression through VACNTs

Summary

• Interleaved Vertically Aligned Carbon Nanotubes (VACNTs)

cause intralaminar fracture under Mode I and Mode II conditions.

• Cracks map the nanotube film topology.
• VACNTs with longer nanotube lengths increase tensile

strength of tapered specimens.

• Nanotubes stabilise laminate after delamination.
• No significant change in laminate stiffness or mass.

8 Delamination Suppression through VACNTs

Future Work

• Fracture toughness when varying nanotube characteristics.
• Modelling of VACNT interleaved tapered specimens.
• Reinforcing notched specimens with VACNTs.

Initial Failure

9 Delamination Suppression through VACNTs

Acknowledgements

The authors would like to acknowledge Rolls-Royce plc for their support of this research through the Composites University Technology Centre at the University of Bristol, UK

Thank you for Listening.

rob.worboys@bristol.ac.uk