Zhezhova, Silvana (2018) Application of textile in different forms and contemporary technologies for obtaining polymer composite structures. PhD thesis, Goce Delcev University, Stip.
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Abstract
Subject of this doctoral dissertation is determining the influence and importance of the form in which textile is used as a reinforcing component, of the physical and mechanical properties of the obtained composite materials and defining the use value of textile materials for various applications in the composite industry. For application, glass fibers were chosen primarily because of their performance in terms of strength / weight ratio, their availability and low price. For the production of all textile composites, an epoxy resin system was used as a matrix. Research within the doctoral dissertation was realized in two parts.
During the first part of the research, E - glass fibers in the form of continuous roving (linear textile structures) were used in obtaining composite tubular structures using filament winding technology. The composite pipes with different design were produced in order to show the influence of the different angles of winding the glass fibers on the physical and mechanical properties of the obtained textile composites. With the assistance of split-disk test method the hoop tensile strength of all manufactured composite pipes was tested. The obtained results showed that the angle of winding of the reinforcing component has a significant influence on the mechanical properties of the composite tubular structures.
Namely, the bigger winding angle provides production of composite pipes with a higher hoop tensile strength in the longitudinal direction, while the strength in the axial direction decreases. This allows design of composite tubular structures with maximum performances by selecting the winding angle of the fibers and optimizing the resistance of the ring in the required direction. Based on the SEM microphotographs, it was noticed that there is a good adhesion between the fibers and the matrix, and at the points of the fracture, some destruction of the two components was observed: the fibers and the matrix.
During the second part of the research, different types of woven structures from E -glass fibers and E - glass mat (two-dimensional textile structures) were used as a reinforcing component in the composite materials. From all types of two-dimensional textile structures, with the application of hand lay - up technology, prepregs with suitable characteristics were produced and additionally processed into composite plates by using compression molding technology. Additionally, composite plates were made from a ready E-unidirectional prepreg. For all manufactured composite plates, an analysis of the content of the constituent’s components and the percentage of voids (%) was made, and the flexural strength and modulus of elasticity in flexure was tested by using a three-point flexural method.
From the obtained results it can be concluded that the composite samples reinforced with E - glass fabrics have optimum resistance of the flexural forces in the longitudinal and transverse direction. The type of reinforcing component and the orientation of the fibers as production parameters influence directly the performance of textile reinforced composite materials.
| Item Type: | Thesis (PhD) |
|---|---|
| Uncontrolled Keywords: | textile composites, glass fibers, glass fabric, non-woven textile, unidirectional tapes, prepreg. |
| Subjects: | Engineering and Technology > Materials engineering |
| Divisions: | Faculty of Technology |
| Depositing User: | Silvana Zezova |
| Date Deposited: | 01 Nov 2018 08:38 |
| Last Modified: | 01 Nov 2018 11:10 |
| URI: | https://eprints.ugd.edu.mk/id/eprint/20713 |
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