[PO-G2] Poster Session 2

[P2-57] Hypervelocity impact and shock behavior of pillared graphene foams

^○Stefano Signetti, Seunghwa Ryu (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Korea)

The effectiveness of graphene as material for impact protection has been confirmed both by atomistic simulations [1] and microscale experiment [2] obtaining unprecedented impact toughness up to ~50 MJ/kg at the nanoscale [1]. However, specific energy absorption could be, in principle, further increased by tailoring inter-layer interaction [3] via interface structuring or functionalization. In this study we present a modified graphene nanoarmor concept obtained by the introduction of pillar structures in the form of carbon nanotubes [4] of variable spatial density, aspect ratio, and size which allow the realization of stable graphene multilayers with variable spacing. Impact strength and shock behavior of such structures are investigated via molecular dynamics (MD) simulations and the effect of foam geometry on the specific energy absorption capability is evaluated across different size-scales.


References
[1] S. Signetti, S. Taioli, N.M. Pugno. 2D Materials Armors Showing Superior Impact Strength of Few Layers. ACS Applied Materials & Interfaces 8:40820-40830, 2017.
[2] J. Lee, P.E. Loya, J. Lou, E.L. Thomas. Dynamic mechanical behaviour of multilayer graphene via supersonic projectile penetration. ACS Applied Materials & Interfaces 346(632):1092-1096, 2014.
[3] S. Signetti, N.M. Pugno. Evidence of optimal interfaces in bio-inspired ceramic-composite panels for superior ballistic protection. Journal of the European Ceramic Society 34:2823-2831, 2014.
[4] S. Lee, D. Kang, I. Oh. Multilayered graphene-carbon nanotube-iron oxide three-dimensional heterostructure for flexible electromagnetic interference shielding film. Carbon 111:248-257, 2017.