Steel and Composite Structures

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Bending, buckling, and free vibration analyses of carbon nanotube reinforced composite beams and experimental tensile test to obtain the mechanical properties of nanocomposite

  • Mohammadimehr, M. (Department of Solid Mechanics, Faculty of Mechanical Engineering, University of Kashan) ;
  • Mohammadi-Dehabadi, A.A. (Department of Solid Mechanics, Faculty of Mechanical Engineering, University of Kashan) ;
  • Akhavan Alavi, S.M. (Department of Solid Mechanics, Faculty of Mechanical Engineering, University of Kashan) ;
  • Alambeigi, K. (Department of Solid Mechanics, Faculty of Mechanical Engineering, University of Kashan) ;
  • Bamdad, M. (Department of Solid Mechanics, Faculty of Mechanical Engineering, University of Kashan) ;
  • Yazdani, R. (Department of Solid Mechanics, Faculty of Mechanical Engineering, University of Kashan) ;
  • Hanifehlou, S. (Department of Solid Mechanics, Faculty of Mechanical Engineering, University of Kashan)
  • Received : 2017.11.12
  • Accepted : 2018.10.24
  • Published : 2018.11.10
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Abstract

In this research, experimental tensile test and manufacturing of carbon nanotube reinforced composite beam (CNTRC) is presented. Also, bending, buckling, and vibration analysis of CNTRC based on various beam theories such as Euler-Bernoulli, Timoshenko and Reddy beams are considered. At first, the experimental tensile tests are carried out for CNTRC and composite beams in order to obtain mechanical properties and then using Hamilton's principle the governing equations of motion are derived for Euler Bernoulli, Timoshenko and Reddy theories. The results have a good agreement with the obtained results by similar researches and it is shown that adding just two percent of carbon nanotubes increases dimensionless fundamental frequency and critical buckling load as well as decreases transverse deflection of composite beams. Also, the influences of different manufacturing processes such as hand layup and industrial methods using vacuum pump on composite properties are investigated. In these composite beams, glass fibers used in an epoxy matrix and for producing CNTRC, CNTs are applied as reinforcement particles. Applying two percent of CNTs leads to increase the mechanical properties and increases natural frequencies and critical buckling load and decreases deflection. The obtained natural frequencies and critical buckling load by theoretical method are higher than other methods, because there are some inevitable errors in industrial and hand layup method. Also, the minimum deflection occurs for theoretical methods, in bending analysis. In this study, Young's and shear modulli as well as density are obtained by experimental test and have not been used from the results of other researches. Then the theoretical analysis such as bending, buckling and vibration are considered by using the obtained mechanical properties of this research.

Keywords

Acknowledgement

Supported by : University of Kashan, ARKA SANAT COMPOSITE Company

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