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A Multi-scale Solution for Prediction of Mechanical Properties of Polymeric Nano Carbon Nanocomposites with Using Stochastic Approach

Jazzab, Mohammad Javad | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54484 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Hosseini Kordkheili, Ali
  7. Abstract:
  8. The use of nanocomposite materials in various industries such as aerospace, oil and gas, automotive, etc. has become increasingly widespread due to its unique thermal and mechanical properties. Due to the problems and costs of the production process and experimental testing for optimal construction, it is necessary to propose a low-cost method for estimating the mechanichal properties of these materials. In this research, the mechanical properties of polymetric nano carbon nanocomposites have been estimated by multi-scale method with using finite element analysis by Abaqus software. the mechanical properties of nanocarbon composites have been extracted by using the multi-scale method that includes the four scales of nano, micro, meso and macro. No modeling has been done at the nanoscale so the results of previous researches have been used. At the micro scale, the mechanical properties of the representative volume element (RVE) of the micro scale, which consists of the carbon nanotube and the interphase, have been calculated using the Tsai-Hahn micromechanical relationships. On the meso scale, a three-dimensional finite element RVE is modeled with periodic boundary condition that all the random states of the particles in terms of location, length, orientation, distribution, and so on considered. At the macro scale, the mechanical properties of the nanocomposite are obtained by considering a three-dimensional finite element model that includes a number of random meso scale results. And the results of the mechanical properties of each scale are considered as the input properties of the larger scale. And the whole process of modeling and analysis in this research has been done in an integrated framework with Abaqus software by scripting in Python language. Therefore, except for nano and micro scale, in both meso and macro scales, three-dimensional finite element analysis has been used. Finally, six different volume fractions of Multi-walled carbon nanotubes as well as three different volume fractions of single-walled carbon nanotubes modeled and the mechanical properties have been predicted by multi-scale method with stochastic approach. It was shown that the numerical results are in good agreement with the available experimental results
  9. Keywords:
  10. Nanocomposite ; Mechanical Properties ; Multiscale Method ; Finite Element Method ; Statistical Analysis ; Nanocarbon ; Carbon Nanotubes Nanocomposites ; Polymer Nanocomposits

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