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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Scheffer, V. C. [1] ; Thevamaran, R. [2] ; Coluci, V. R. [1]
Total Authors: 3
Affiliation:
[1] Univ Campinas UNICAMP, Sch Technol, BR-13484332 Limeira, SP - Brazil
[2] Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 - USA
Total Affiliations: 2
Document type: Journal article
Source: Applied Physics Letters; v. 112, n. 2 JAN 8 2018.
Web of Science Citations: 2
Abstract

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)

FAPESP's process: 16/01736-9 - Computational modeling of rupture mechanisms of graphene oxide
Grantee:Vitor Rafael Coluci
Support Opportunities: Regular Research Grants
FAPESP's process: 10/50646-6 - High performance computing applied in interdisciplinary problems
Grantee:Vitor Rafael Coluci
Support Opportunities: Regular Research Grants