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Experimental and Analytical Investigation of Elastic-Plastic Behavior of Glass Fiber Reinforced Polymer Composites

Sajadi, Banafshe | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41603 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Naghdabadi, Reza; Asghari, Mohsen
  7. Abstract:
  8. In this thesis, we aim to study the elastic-plastic behavior of short fiber reinforced composites experimentally and analytically. The experimental investigation is applied to glass fiber-polypropylene composites (PP/GF). The samples are produced by injection process with maximum temperature of 190C. Fibers are randomly oriented in this procedure of fabrication. The samples are tested in tension, and the mechanical strength is measured by changes in fiber content. The Young's modulus is also investigated in these experiments.Also in this thesis, an analytical model for calculation of Young’s modulus of fiber reinforced composite materials is proposed. In this analysis a displacement field is suggested for both fiber and matrix. This displacement field is for the case that the fibers are aligned in the tension direction. Then, an experimental parameter which we name "effective length" is introduced. Using this parameter, the random orientation of the fibers is taken in account in calculations. The calculated Young's modulus obtained from this model is then compared with the results of the experiments and indicates a good agreement.In the next step, we have proposed a displacement field for the local plastic deformation of the matrix, and so by use of the experimentally based parameter "effective length" instead of fiber length, the behavior of the assumed RVE is studied and the results are compared with the results of standard tension experiments.
  9. Keywords:
  10. Composite ; Polypropylene ; Plasticity ; Elasticity ; Glass Fibers

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