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Manufacturing and Mechanical Characterization of Polymeric Composites Reinforced with Natural Fibers

Abolhassani, Shahrooz | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50601 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Rajabzade, Fallah; Akbari
  7. Abstract:
  8. With increasing awareness, artificial materials have been replaced by recyclable materials and green materials. In the manufacture of composites, natural and degradable materials are also used. The main object of this research is the fabrication of natural fiber reinforced composites. In this research, fibers are used that are cultivated in the country. Also, the effect of fiber length, fiber mass percentage and fiber correction on composite properties was investigated. The fiber length factor is at two levels of 5 mm and 9 mm, the percentage of fiber mass is in four levels of 5%, 10%, 12.5% and 15%, and the factor for correction of fibers is also in two groups of modified fibers and unmodified fibers. Designing experiments using the Taguchi array. The epoxy resin EPR1080 was used as the matrix. The fiber used in this research is kenaf fiber, which is produced from the Agricultural Research and Education Center of Tehran Province, located in the city of Varamin. The kenaf plant was soaked in water and the fiber was extracted from the plant. Then the fibers were chopped and dried. The method of manufacturing composite samples is hand lay-up. The results of the tests showed that the maximum tensile strength and tensile modulus were 37.68 MPa and 4.94 GPa respectively, and the maximum flexural strength and flexural modulus were 78.31 MPa and 6.05 GPa respectively, and the water absorption was 0.3%. The results of Taguchi analysis showed that optimum fiber percentages were used to maximize tensile strength and tensile modulus and flexural strength is 12.5% and to maximize flexural modulus is 10% and to minimize water absorption is 5%. Fiber modification increased the tensile and flexural properties and resistance to water absorption. The length of the fiber only affects the tensile modulus, and the optimal level is 9 mm. finally, the micromechanical analysis of the tensile properties of the samples was done and the results of the analysis were similar in the average percentages with the results obtained from the tests
  9. Keywords:
  10. Composite ; Mechanical Properties ; Natural Fiber ; Fiber Reinforced Composite ; Epoxy Resin ; Kenaf Fiber

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