Effect of Fiber Orientation on Tensile Properties of Short Glass Fiber Reinforced Injection Molding Polypropylene Composite
The objective of this study is to examine the behaviour of composites and to provide an overview of short glass fiber reinforced injection-moulded theimoplastic, SgFRIMT in relation to the fiber orientation direction. In this study, the relationship between the mechanical propesties of samples co...
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis |
| Language: | English English |
| Published: |
2004
|
| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/6792/1/ITMA_2004_1.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The objective of this study is to examine the behaviour of composites and to provide an
overview of short glass fiber reinforced injection-moulded theimoplastic, SgFRIMT in
relation to the fiber orientation direction. In this study, the relationship between the
mechanical propesties of samples containing longitudinal and transverse direction was
studied in terms of the effects of injection speed, fiber concentration and fiber length on
the mechanical properties of SgFRIMT. The orientation of fiber distribution in
longitudinal and transverse direction was measured according to the gate position and
samples- taken from identified position were investigated and tested at an angle relative to
the fiber direction.
The composite consisting of 5, 10, 15% wt of glass fiber was prepared using single screw
extsuder model Brabender Plasticoder PL 2000, a compression molding machine and an
80-tonne Toshiba injection molding machine. The tensile properties were evaluated by Instron testing machine model 4301. The discussion focuses on the effects of fiber
concentration, injecting speed and fiber length on tensile properties of a SgFRIMT.
Tensile strength shows a steady decrease with increasing percentage of fiber loadings. In
contrast, the tensile modulus increases significantly with an increase in the fiber loadings.
At higher fiber concentration, the values of the modulus were higher than those of the
unfilled polypropylene. The fiber breakage that occurs during sample preparation reduces
the overall tensile strength significantly.
Additional investigation was carried out on the effect of fiber breakage using 6 and 12
mm fiber length, where it was obsesved that the fiber breakage occurs during
compounding stages with approximately 80% reduction in initial fiber length.
Observation on the extrudates reveals that poor fiber matrix interaction causes the failure
of the prepared samples. The presence of void and the agglomeration inside the samples
considerably affects the mechanical properties of the composites. The results indicate that
the stiffness and toughness of the SgFRIMT generally are influenced by the addition of
glass fibers. In this study the influence of the injection speed was insignificant.
The results of average fiber length agree with the results of other previous studies on
SgFRIMT materials, indicating that the fiber length has major influence on the tensile
properties of the prepased samples. |
|---|