Coupling of Injection Molding Process to Mechanical Properties of Short Glass Fiber Reinforced Thermoplastics
碩士 === 國立高雄應用科技大學 === 模具工程系 === 104 === Fiber reinforced polymers in general may be either thermoplastics or thermosets commonly reinforced with glass or carbon fibers. With advancement in the field of mechanical and automobile industry, short-fiber-reinforced polymers (SFRPs) have wisely been appl...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2016
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| Online Access: | http://ndltd.ncl.edu.tw/handle/durm4a |
| Summary: | 碩士 === 國立高雄應用科技大學 === 模具工程系 === 104 === Fiber reinforced polymers in general may be either thermoplastics or thermosets commonly reinforced with glass or carbon fibers. With advancement in the field of mechanical and automobile industry, short-fiber-reinforced polymers (SFRPs) have wisely been applied to structural components to reduce their weight so as to increase more demands in using SFRPs to replace certain metals structural components. These composites with higher strength and longer lifespan are more important in products.
This paper investigated the mechanical properties of polycarbonate reinforced with 20 wt.% short glass fiber after injection molding. Mechanical properties of SFRPs strongly depend on fiber orientation which will be affected by the molding process variables such as mold cavity geometry and injection process parameters (e.g. gate location, mold cavity geometry and injection pressure etc.). Therefore it is essential to obtain the fiber orientation and density distribution of product by molding simulation before the mechanical properties can be calculated. In this paper, three published micromechanical models are carried to compute the stiffness of each element and substitute into finite element model for uniaxial tension and three-point bending structural analysis. Numerical results are then compared and verified with experiments.
Analysis results showed that all model predicted mechanical higher stiffness than experiments. The stress and strain distribution of Mori-Tanaka model was similar to Halpin-Tsai model. It is show that the Halpin-Tsai model gave a small difference for strain and displacement distribution and the Mori-Tanaka model gave a small difference for stress and flexural strength.
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