Analysis of carbon fiber alignment in a polydimethylsiloxane matrix flowing in an orifice channel
| Autor: | Dong-Wook Oh, Hoang Minh Khoa Nguyen |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Flow visualization
Materials science 02 engineering and technology 010402 general chemistry 01 natural sciences Physics::Fluid Dynamics chemistry.chemical_compound Materials Chemistry Fiber Physical and Theoretical Chemistry Composite material Anisotropy Spectroscopy chemistry.chemical_classification Polydimethylsiloxane Velocity gradient Polymer 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Shear (sheet metal) chemistry 0210 nano-technology Body orifice |
| Zdroj: | Journal of Molecular Liquids. 317:113978 |
| ISSN: | 0167-7322 |
| DOI: | 10.1016/j.molliq.2020.113978 |
| Popis: | Owing to their remarkable physical properties compared to those of the other conventional materials, polymer composites are gaining increasing attention. In addition, it is well known that fiber-type additives are more effective in enhancing the mechanical and thermal properties of composites than other types of additives. However, the additive fibers tend to align in certain directions during the molding process and significantly affect the anisotropy of the medium. To understand the additive alignment and orientation during an injection molding process, we performed a flow visualization experiment and compared the fiber alignment with the flow field calculated from a computational fluid dynamics simulation. A mixture of polydimethylsiloxane and carbon fibers was utilized as the working fluid inside an orifice channel, which together approximated a molten polymer composite flow in a mold during the polymer fabrication process. Observation of rotation of fibers in the flow visualization images was quantified and compared to the velocity gradient fields. The magnitudes of the extension and shear rates were found to be responsible for perpendicular and parallel alignments of fibers inside the orifice channel. |
| Databáze: | OpenAIRE |
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