In this study, effect of injection molding process parameters on fiber
length and on mechanical properties of Polyamide-6 / glass fiber composite were
investigated to produce higher performance composites. Polyamide-6 was first
compounded with an E-grade glass fiber in a co-rotating intermeshing twin screw
extruder. Then, by using this composite, twenty-five types of experiments were
performed by injection molding by changing the barrel temperature, injection
pressure, hold pressure, mold temperature, cooling time and screw speed. Izod
notched impact, tensile, viscosity, heat deflection temperature, differential
scanning calorimetry tests were performed on injection molded samples. By
performing these tests, the effects of process parameters on mechanical properties
and on fiber length were observed. In order to understand the variation in
mechanical properties, thermal tests were also conducted. Also, fiber length
distributions of the samples were measured.Experimental data show that fiber breakage decreases with increasing
screw speed, injection pressure, however, fiber length increases with increasing
barrel temperature, mold temperature and cooling time. Fiber length is almost not
affected with the hold pressure. It is assumed in this study that crystallinity is not
affected with injection pressure, hold pressure and screw speed. As barrel
temperature and cooling time increase, crystallinity increases, however, as mold
temperature increases, crystallinity decreases. Impact strength, tensile modulus
and tensile strength increase, whereas elongation at break decreases with the
average fiber length. Crystallinity affects the tensile strength and modulus
positively. The tensile strength and modulus increase with increasing crystallinity.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12608475/index.pdf |
| Date | 01 June 2007 |
| Creators | Cansever, Cahit Can |
| Contributors | Yilmazer, Ulku |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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