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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.)

Compressive response and deformation mechanisms of vertically aligned helical carbon nanotube forests

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Autor(es):
Scheffer, V. C. [1] ; Thevamaran, R. [2] ; Coluci, V. R. [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Campinas UNICAMP, Sch Technol, BR-13484332 Limeira, SP - Brazil
[2] Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 - USA
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Applied Physics Letters; v. 112, n. 2 JAN 8 2018.
Citações Web of Science: 2
Resumo

We study the dynamic compressive response of vertically aligned helical carbon nanotube forests using a mesoscale model. To describe the compressive response, the model includes the helical geometry of the constituent coils, the entanglement between neighboring coils, and the sideway interactions among coils. Coarse-grained simulations show forest densification and stress localization, which are caused by different deformation mechanisms such as coil packing, buckling, and crushing. We find that these mechanisms depend on the initial overlap between coils and lead to a nonlinear stress-strain behavior that agrees with recent impact experiments. The nonlinear stressstrain behavior was shown to be composed of an initial linear increase of stress in strain followed by an exponential growth. These regimes are an outcome of the characteristics of both the individual coils and the entangled morphology of the forests. Published by AIP Publishing. (AU)

Processo FAPESP: 16/01736-9 - Modelagem computacional de mecanismos de ruptura do óxido de grafeno
Beneficiário:Vitor Rafael Coluci
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 10/50646-6 - Aplicação de computação de alto desempenho em problemas interdisciplinares
Beneficiário:Vitor Rafael Coluci
Modalidade de apoio: Auxílio à Pesquisa - Regular