Fracture, failure and compression behaviour of a 3D interconnected carbon aerogel (Aerographite) epoxy composite
| Autor: | Wilfried V. Liebig, Matthias Mecklenburg, Rainer Adelung, Bodo Fiedler, Swetha Chandrasekaran, Karl Schulte, Daria Smazna |
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| Rok vydání: | 2016 |
| Předmět: |
Toughness
Nanocomposite Materials science Scanning electron microscope Composite number General Engineering Fractography 02 engineering and technology Epoxy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Fracture toughness visual_art Ceramics and Composites visual_art.visual_art_medium Composite material 0210 nano-technology Aerographite |
| Zdroj: | Composites Science and Technology. 122:50-58 |
| ISSN: | 0266-3538 |
| DOI: | 10.1016/j.compscitech.2015.11.002 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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