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 stress-strain 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.
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8 January 2018
Research Article|
January 08 2018
Compressive response and deformation mechanisms of vertically aligned helical carbon nanotube forests
V. C. Scheffer;
V. C. Scheffer
1
School of Technology, University of Campinas–UNICAMP
, Limeira, SP 13484-332, Brazil
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R. Thevamaran;
R. Thevamaran
2
Department of Engineering Physics, University of Wisconsin-Madison
, Madison, Wisconsin 53706, USA
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V. R. Coluci
V. R. Coluci
1
School of Technology, University of Campinas–UNICAMP
, Limeira, SP 13484-332, Brazil
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Appl. Phys. Lett. 112, 021902 (2018)
Article history
Received:
October 11 2017
Accepted:
December 23 2017
Citation
V. C. Scheffer, R. Thevamaran, V. R. Coluci; Compressive response and deformation mechanisms of vertically aligned helical carbon nanotube forests. Appl. Phys. Lett. 8 January 2018; 112 (2): 021902. https://doi.org/10.1063/1.5008983
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