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

2 Outline • VACNTs Background • Fracture Toughness Enhancement • Mode I and Mode II • Ply-Drop Strength Enhancement • Summary and Future Work Delamination Suppression through VACNTs

3 VACNTs Background CNT Micro- buckling Delamination VACNT Film Delamination Suppression through VACNTs

4 Fracture Toughness Enhancement MODE I - DCB MODE II - ELS Delamination Suppression through VACNTs

5 Ply Drop Strength Enhancement Delamination Suppression through VACNTs

6 Ply Drop Strength Enhancement BASELINE 11 μ m VACNTs 40 μ m VACNTs Interleave Interleave Delamination Suppression through VACNTs

7 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. Delamination Suppression through VACNTs

8 Future Work • Fracture toughness when varying nanotube characteristics. • Modelling of VACNT interleaved tapered specimens. • Reinforcing notched specimens with VACNTs. Initial Failure Delamination Suppression through VACNTs

9 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 Delamination Suppression through VACNTs

Thank you for Listening. rob.worboys@bristol.ac.uk