Deformation behaviour of re-entrant carbon honeycomb structures

Open School-Conference of NIS Countries Ultrafine Grained and Nanostructured Materials

Rysaeva, L.K.^1 ; Klyavlina, A.I.^2 ; Galiachmetov, Kh F.^1 ; Baimova, J.A.^1,2 ; Lisovenko, D.S.^3 ; Gorodtsov, V.A.^3

Institute for Metals Superplasticity Problems, Russian Academy of Sciences, Khalturina 39, Ufa

450001, Russia^1

Bashkir State University, Validy Str. 32, Ufa

450076, Russia^2

Ishlinsky Institute for Problems in Mechanics, Russian Academy of Sciences, Prospekt Vernadskogo 101-1, Moscow

119526, Russia^3

关键词: Carbon structures;    Cellular structure;    Deformation behaviour;    High deformability;    High strain rates;    Loading direction;    Molecular dynamics simulations;    Structural parameter;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/447/1/012035/pdf
DOI  :  10.1088/1757-899X/447/1/012035

来源: IOP

【 摘 要 】

Recent successes of researchers in the fabrication of new carbon structures of different morphologies and dimensions open up broad prospects for the development of carbon materials with qualitatively new properties. Such promising materials are cellular structures (or carbon aerogels) that have high deformability, good adsorption and conductivity characteristics. In this work, we consider a carbon structure consisting of re-entrant honeycomb cells, which allow the structure to be auxetic. The stability and deformation behaviour of re-entrant carbon honeycomb structures is studied by molecular dynamics simulation. The effect of structural parameters on the stability of carbon aerogel is discussed. It is shown that structural changes significantly depend on the strain rate and the loading direction. At a high strain rate in tension along the z-axis, all cells open slightly at the same time. On the contrary, at small strain rates, certain cells open, while others almost completely collapse, which is expected to result in changes in physical properties, for example, in conductivity. During tension along the x-axis, a transformation from a re-entrant honeycomb to a traditional honeycomb took place.