Fracture, failure and compression behaviour of a 3D interconnected carbon aerogel (Aerographite) epoxy composite

被引:30
作者
Chandrasekaran, Swetha [1 ]
Liebig, Wilfried V. [2 ]
Mecklenburg, Matthias [2 ]
Fiedler, Bodo [2 ]
Smazna, Dania [3 ]
Adelung, Rainer [3 ]
Schulte, Karl [2 ]
机构
[1] Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA
[2] Tech Univ Hamburg, Inst Kunststoffe & Verbundwerkstoffe, Denickestr 15, D-21073 Hamburg, Germany
[3] Univ Kiel, Inst Mat Wissensch Funkt Nanomat, Kaiserstr 2, D-24143 Kiel, Germany
关键词
Nanocomposites; Fracture toughness; Mechanical properties; Fractography; Scanning electron microscopy; GRAPHENE FOAM; MECHANICAL-PROPERTIES; ELECTRICAL-CONDUCTIVITY; NANOCOMPOSITES; FABRICATION; LIGHTWEIGHT; NANOTUBES; MATRIX; ENERGY;
D O I
10.1016/j.compscitech.2015.11.002
中图分类号
TB33 [复合材料];
学科分类号
摘要
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.
引用
收藏
页码:50 / 58
页数:9
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