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The Effect of Structural Defects of Graphene Reinforced Polymer Nanocomposites on Mechanical Properties

Bazmara, Maziyar | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50461 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Naghd Abadi, Reza
  7. Abstract:
  8. Nanocomposites are widely used due to unique properties such as low density and high strength in many industries such as electronics, telecommunications, aerospaces, Petrochemicals and shipbuildings. Meanwhile, due to the importance of economic issues, polymer based nanocomposites are the most used type of nanocomposites. The purpose of this thesis is studing the structural defects of graphene-reinforced nanocomposite polymers on the mechanical properties of these materials. Defects created in nanocomposites can be divided into two categories after construction. The first category is the defects that are created in the graphene structure when it is synthsis, and the second happen at the bonding surface of the graphene with matrix (interphase region) during making nanocomposites. Due to the discrete nature of graphene, the use of continuum mechanics is impossible to model these defects. Also the Molecular Dynamics simulation has a huge computational cost. To overcome these problems, the atomic scale finite-element (AFEM) method has been used based on the Tersoff-Brenner potential for graphene simulation and the Lenard-Jones potential for the interphase in this work. Elastic modulus computed for graphene is 0.813 TPa that has a good agreement with the results in the literature. The effect of defected graphene in Elastic modulus was about 3% compare with the pristine graphene. Also, the effect of perfect bonding on the elastic modulus of the nanocomposite was about 21% higher than the calculated value for adhesion bond. These results showed that the defect in the interphase is much more effective than the graphene defect on the mechanical properties of the nanocomposite
  9. Keywords:
  10. Atomic Scale Finite Element Method ; Interphase ; Mechanical Properties ; Polymer Matrix Composite ; Structural Defect

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