Chandrasekaran, S., Liebig, W. V., Mecklenburg, M., Fiedler, B., Smazna, D., Adelung, Rainer and Schulte, K. (2016) Fracture, failure and compression behaviour of a 3D interconnected carbon aerogel (Aerographite) epoxy composite. Composites Science and Technology, 122 . pp. 50-58. DOI 10.1016/j.compscitech.2015.11.002.

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Abstract

Aerographite (AG) is a mechanically robust, lightweight synthetic cellular material, which consists of a 3D interconnected network of tubular carbon [1]. The presence of open channels in AG aids to infiltrate them with polymer matrices, thereby yielding an electrical conducting and lightweight composite. Aerographite produced with densities in the range of 7-15 mg/cm(3) was infiltrated with a low viscous epoxy resin by means of vacuum infiltration technique. Detailed morphological and structural investigations on synthesized AG and AG/epoxy composite were performed by scanning electron microscopic techniques. The present study investigates the fracture and failure of AG/epoxy composites and its energy absorption capacity under compression. The composites displayed an extended plateau region when uni-axially compressed, which led to an increase in energy absorption of similar to 133% per unit volume for 1.5 wt% of AG, when compared to pure epoxy. Preliminary results on fracture toughness showed an enhancement of similar to 19% in K-IC for AG/epoxy composites with 0.45 wt% of AG. Observations of fractured surfaces under scanning electron microscope gives evidence of pull-out of arms of AG tetrapod, interface and inter-graphite failure as the dominating mechanism for the toughness improvement in these composites. These observations were consistent with the results obtained from photoelasticity experiments on a thin film AG/epoxy model composite. Published by Elsevier Ltd.

Document Type:	Article
Additional Information:	Times Cited: 5 Chandrasekaran, Swetha Liebig, Wilfried V. Mecklenburg, Matthias Fiedler, Bodo Smazna, Dania Adelung, Rainer Schulte, Karl
Keywords:	Nanocomposites, Fracture toughness, Mechanical properties, Fractography, Scanning electron microscopy
Research affiliation:	Kiel University > Kiel Marine Science OceanRep > The Future Ocean - Cluster of Excellence
Refereed:	Yes
Open Access Journal?:	No
Publisher:	Elsevier
Projects:	Future Ocean
Date Deposited:	01 Mar 2017 08:24
Last Modified:	20 May 2019 13:03
URI:	https://oceanrep.geomar.de/id/eprint/36033

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