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Preparation and fatigue behavior of graphene-based aerogel/epoxy nanocomposites

Kordi, A ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. Publisher: Walter de Gruyter GmbH , 2021
  3. Abstract:
  4. In this research, the effect of adding graphene-based aerogel ((G)A) nanoparticles on the tensile and fatigue behavior of the epoxy polymer was investigated. Specimens of nanocomposites were prepared by adding 0.05, 0.1, 0.2, 0.5, 1, and 2 wt.-% (G)A nanoparticles to the epoxy polymer. Tensile tests revealed that the 0.1 wt.-% graphene-based aerogel/ epoxy ((G)A/E) nanocomposites had the highest increase in tensile strength with 19 % growth compared to neat epoxy. Also, the tensile modulus increased by 15 % in the 0.5 wt.-% (G)A/E nanocomposites. A substantial improvement in fatigue life of the epoxy polymer was observed on adding 0.1 wt.-% (G)A nanoparticles. For instance, the fatigue life of (G)A/E nanocomposites improved by 236 % at a maximum stress of 35 MPa compared to the neat epoxy. Fractography in failure analysis of the test samples showed that the placement of (G)A porous nanoparticles on the epoxy polymer with crack twist or crack tilt prevent the formation of large and catastrophic cracks, resulting in delaying the fatigue failure. © 2021 Walter de Gruyter GmbH, Berlin/Boston, Germany
  5. Keywords:
  6. Cracks ; Fatigue of materials ; Fractography ; Fracture mechanics ; Graphene ; Nanocomposites ; Nanoparticles ; Tensile strength ; Tensile testing ; Epoxy ; Epoxy nanocomposites ; Epoxy polymers ; Epoxy-based nanocomposites ; Fatigue behaviour ; Fatigue properties ; Graphene-based aerogel ; Maximum stress ; Tensile behaviors ; Tensile property ; Aerogels
  7. Source: Materialpruefung/Materials Testing ; Volume 63, Issue 2 , 2021 , Pages 163-168 ; 00255300 (ISSN)
  8. URL: https://www.sciencegate.app/document/10.1515/mt-2020-0023