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Extraction of Mechanical Properties of Polymer Composites Reinforced with Three-Dimensional Orthogonal Woven Fabrics

Pilafkan, Neda | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56472 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Hosseini KordKheili, Ali; Saleh Ahmadi, Mohammad
  7. Abstract:
  8. The two-dimensional composites are benefited from different advantageous; however, they may not be good enough in terms of strength along the thickness, manufacturing speed, cost management and resistance to delamination. To overcome these unpleasant challenges, the three-dimensional composites are defined as having a 3D pattern of yarns which not only includes yarns along the length and width, but also in thickness or vertical direction. One of these common types of composites is 3D-orthogonal woven composites. In this comprehensive research study, the 3D orthogonal woven composite modelling is conducted through a specialized and advanced software, TexGen software. Then Voxel mesh were applied to develop network and finally the results were analyzed by Abaqus. In order to assure the reliability and mesh-independency of final results, the mesh study was meticulously employed. It worth mentioning that by increasing the number of elements up to 7000, the uncertainty of modelling results was shrunk to around 1 percent. In the first part, three different types of 3D-orthogonal geometry were analyzed to address the impact of geometry of weave on the mechanical properties. As a result, the first type with 0.59 yarn volume fraction could show more desirable output in terms of mechanical properties, compared with two other types of interest. In more details, the third type with 0.58 yarn volume fraction provide higher mechanical properties than the second type with 0.56 yarn volume fraction. What is more, the effect of yarn material on mechanical properties alteration were studied through analyzing three different types of material including Carbon, Kevlar and Glass under the same geometrical structure (type-I), and the results demonstrated that composite reinforced with carbon fibers has the more satisfied mechanical properties along warp yarn and composite made from glass fibers showed more acceptable mechanical properties in directions of weft and thickness. Moreover, the effect of fiber volume fraction on the mechanical properties were addressed by analyzing the type-I structure with varying fiber volume fraction from 49 to 64. The results showed that the more the fiber volume fraction of 3D-orthogonal woven composites, the higher the improvement of mechanical properties such as elastic modulus will be. In the second part of this study, 3D fabric weave machine was studied which caused to developing the design of machine at laboratory scale
  9. Keywords:
  10. Mechanical Properties ; ABAQUS Software ; Polymer Composites ; Three Dimensional Composites ; Orthogonal Woven Composites ; TexGen Software

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