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Anomalous impact and strain responses in helical carbon nanotube foams

Thevamaran, Ramathasan and Karakaya, Mehmet and Meshot, Eric R. and Fischer, Andre and Podilla, Ramakrishna and Rao, Apparao M. and Daraio, Chiara (2015) Anomalous impact and strain responses in helical carbon nanotube foams. RSC Advances, 5 (37). pp. 29306-29311. ISSN 2046-2069.

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We describe the quasistatic and dynamic response of helical carbon nanotube (HCNT) foams in compression. Similarly to other CNT foams, HCNT foams exhibit preconditioning effects in response to cyclic loading; however, their fundamental deformation mechanisms are unique. In quasistatic compression, HCNT foams exhibit strain localization and collective structural buckling, nucleating at different weak sections throughout their thickness. In dynamic compression, they undergo progressive crushing, governed by the intrinsic density gradient along the thickness of the sample. HCNT micro-bundles often undergo brittle fracture that originates from nanoscale defects. Regardless of this microstructural damage, bulk HCNT foams exhibit super-compressibility and recover more than 90% of large compressive strains (up to 80%). When subjected to striker impacts, HCNT foams mitigate impact stresses more effectively compared to other CNT foams comprised of non-helical CNTs ([similar]50% improvement). The unique mechanical properties we revealed demonstrate that the HCNT foams are ideally suited for applications in packaging, impact protection, and vibration mitigation.

Item Type:Article
Related URLs:
URLURL TypeDescription
Thevamaran, Ramathasan0000-0001-5058-6167
Karakaya, Mehmet0000-0002-4475-4352
Meshot, Eric R.0000-0002-7951-6696
Daraio, Chiara0000-0001-5296-4440
Additional Information:© 2015 The Royal Society of Chemistry. Received 27th February 2015. Accepted 16th March 2015. We acknowledge Fabian Gramm (ScopeM, ETH Zurich) for assistance in TEM imaging and Jan Rys (ETH Zurich) for assistance in SEM imaging. We acknowledge financial support from the Institute for Collaborative Biotechnologies (ICB) under the contract W911NF-09-D-0001 with the Army Research Office (ARO). A portion of this work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. X-ray characterization was performed at beamline 7.3.3 at the Advanced Light Source, which is supported by the Director, Office of Science, and Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract no. DE-AC02-05CH11231.
Funding AgencyGrant Number
Army Research Office (ARO)W911NF-09-D-0001
Department of Energy (DOE)DE-AC52-07NA27344
Department of Energy (DOE)DE-AC02-05CH11231
Issue or Number:37
Record Number:CaltechAUTHORS:20150401-100212731
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Official Citation:Anomalous impact and strain responses in helical carbon nanotube foams Ramathasan Thevamaran, Mehmet Karakaya, Eric R. Meshot, Andre Fischer, Ramakrishna Podila, Apparao M. Rao and Chiara Daraio RSC Adv., 2015, 5, 29306-29311 DOI: 10.1039/C5RA03561A, Paper
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56276
Deposited By: Ruth Sustaita
Deposited On:01 Apr 2015 19:40
Last Modified:03 Oct 2019 08:12

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