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Experimental Studies and Finite Element Analysis of Polymer Nanocomposites Reinforced with Graphene Sheets under Impact Loading

Zarei Darani , Sajad | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47976 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Naghdabadi, Reza; Sohrabpour, Saeed
  7. Abstract:
  8. In the experimental approach, graphene and Graphene Oxide (GO) were synthesized through a chemical method. In order to study the quality of GO, characterization tests were performed. Then, reinforced polymer with GO and graphene was made. Moreover, tension, compression and Split- Hopkinson pressure bar tests were performed on standard samples of reinforced polymer nanocomposite. The experimental data show that nanoparticles have a destructive effect in very low and high percentages for extension test as well as in high percentages for compression test. On the other hand, graphene is more effective than GO on improving material properties. Furthermore, comparison of compression results in different strain rates show that GO has less effect on the properties, in high strain rates than low ones. In the numerical approach, graphene is modeled with Molecular Mechanic (MM) method and its surface elastic properties are obtained. To simulate the nanocomposite, using a multiscale finite element method, a proper representative volume element (RVE) which considers polymer, graphene and the interphase is represented. The response of this RVE is simulated under static and dynamic loadings. With considering different properties for the interphase as well as different volume fractions of graphene, Young’s modulus and strain energy of RVE under impact loading is obtained. The effects of graphene position in the RVE, as well as the angle of graphehe and the multilayer graphene are also investigated. Finally, a novel formulation is developed taking into account the producing defect effects for predicting Young’s modulus. Also the simulation results show a good agreement with the experimental results
  9. Keywords:
  10. Polymer Nanocomposits ; Graphene ; Impact ; Finite Element Method ; Epoxy Silica Nanocomposite ; Impact Loading ; Epoxy Compounds

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