Electro-mechanical characterization of three-dimensionally conductive graphite/epoxy composites under tensile and shear loading
| Autor: | Yong Kim, Asha Hall, Riley Sherman, Latha Nataraj, Mulugeta A. Haile, Michael Coatney, Vijaya Chalivendra |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Polymers and Plastics Composite number Compression molding 02 engineering and technology Carbon nanotube Epoxy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Shear (sheet metal) Electrical resistance and conductance Mechanics of Materials law visual_art Ultimate tensile strength Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Graphite Composite material 0210 nano-technology |
| Zdroj: | Composites Communications. 15:30-33 |
| ISSN: | 2452-2139 |
| DOI: | 10.1016/j.coco.2019.05.010 |
| Popis: | An experimental study was performed to compare the electro-mechanical response of three-dimensionally conductive woven carbon fiber/epoxy laminated composites under quasi-static uniaxial tensile and in-plane shear loading conditions. Three-dimensional (3D) electrical network was generated in these composites by embedding carbon nanotubes (CNTs) of 0.025 wt% in the epoxy and reinforcing short carbon fibers (150 μm and 350 μm long) with a fiber density of 1000 fibers/mm2 between the laminates using electro-flocking process. CNTs are effectively dispersed in the epoxy matrix using a combination of ultrasonication and shear mixing techniques. A compression molding fabrication technique was employed to fabricate composite materials. For all composite types, in general, the in-situ electrical response showed a trend of initial decrease in resistance and later increase in resistance for tensile loading. However, no noticeable increase in electrical resistance was observed until failure of the composite under shear loading conditions. Both CNTs and short carbon fibers made new contacts with neighboring carbon fiber laminates for entire duration of shear loading even though the composite was undergoing progressive failure. |
| Databáze: | OpenAIRE |
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