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Published May 2016 | Supplemental Material
Journal Article Open

Rate-sensitive strain localization and impact response of carbon nanotube foams with microscale heterogeneous bands


We describe the deformation mechanisms and the bulk dynamic response of vertically aligned carbon nanotube (VACNT) foams comprised of bands of different densities. The densities of the bands are controlled during synthesis by varying the flow-rate of gas feedstock in discrete steps. We show that the impact response of VACNT foams can be distinctively tailored by introducing heterogeneous bands. For example, we demonstrate that this approach can be used to maintain the stress plateau at low stresses over a broad range of strains and to disrupt the expected progressive deformation of the sample. These are desirable characteristics for impact and energy absorption applications. The banded VACNT foams exhibit different deformation mechanisms in dynamics compared to those in quasistatic compression, as observed through in-situ high-speed microscopy.

Additional Information

© 2016 Elsevier Ltd. Received 18 August 2015; Received in revised form 25 November 2015; Accepted 20 December 2015; Available online 15 January 2016. This work was supported by the Institute for Collaborative Biotechnologies (ICB) under the contract W911NF-09-D-0001 with the Army Research Office (ARO). The authors thank Mr. Jake Christoph for synthesizing supplemental samples related to this study in the laboratory of Prof. David Jack.

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