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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Scale Effects on the Ballistic Penetration of Graphene Sheets

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Autor(es):
Bizao, Rafael A. [1, 2] ; Machado, Leonardo D. [1, 3] ; de Sousa, Jose M. [1, 4] ; Pugno, Nicola M. [2, 5, 6] ; Galvao, Douglas S. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil
[2] Univ Trento, Dept Civil Environm & Mech Engn, Lab Bioinspired & Graphene Nanomech, Via Mesiano 77, Trento - Italy
[3] Univ Fed Rio Grande do Norte, Dept Fis Teor & Expt, BR-59072970 Natal, RN - Brazil
[4] Univ Fed Piaui, Dept Fis, BR-64049550 Teresina, Piaui - Brazil
[5] Italian Space Agcy, Edoardo Amaldi Fdn, Ket Lab, Via Politecn Snc, I-00133 Rome - Italy
[6] Queen Mary Univ London, Sch Engn & Mat Sci, Mile End Rd, London E1 4NS - England
Número total de Afiliações: 6
Tipo de documento: Artigo Científico
Fonte: SCIENTIFIC REPORTS; v. 8, APR 30 2018.
Citações Web of Science: 1
Resumo

Carbon nanostructures are promising ballistic protection materials, due to their low density and excellent mechanical properties. Recent experimental and computational investigations on the behavior of graphene under impact conditions revealed exceptional energy absorption properties as well. However, the reported numerical and experimental values differ by an order of magnitude. In this work, we combined numerical and analytical modeling to address this issue. In the numerical part, we employed reactive molecular dynamics to carry out ballistic tests on single, double, and triple-layered graphene sheets. We used velocity values within the range tested in experiments. Our numerical and the experimental results were used to determine parameters for a scaling law. We find that the specific penetration energy decreases as the number of layers (N) increases, from similar to 15 MJ/kg for N = 1 to similar to 0.9 MJ/kg for N = 350, for an impact velocity of 900 m/s. These values are in good agreement with simulations and experiments, within the entire range of N values for which data is presently available. Scale effects explain the apparent discrepancy between simulations and experiments. (AU)

Processo FAPESP: 13/08293-7 - CECC - Centro de Engenharia e Ciências Computacionais
Beneficiário:Munir Salomao Skaf
Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs