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

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/cm3 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. Our 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 ~133% per unit volume for 1.5 wt% of AG, when compared to pure epoxy. Preliminary results on fracture toughness showed an enhancement of ~19% in KIC for AG/epoxy composites with 0.45 wt% of AG. Furthermore, our 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 photoelasticitymore » experiments on a thin film AG/epoxy model composite.« less
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [3] ;  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Technical Univ. of Hamburg (Germany)
  3. Christian-Albrechts Univ., Kiel (Germany)
Publication Date:
OSTI Identifier:
1227353
Report Number(s):
LLNL-JRNL--678286
Journal ID: ISSN 0266-3538
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Composites Science and Technology
Additional Journal Information:
Journal Volume: 122; Journal ID: ISSN 0266-3538
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE nanocomposites; fracture toughness; mechanical properties; fractography; scanning electron microscopy