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Impact of the Process-induced Microstructure on the Mechanical Performance of Injection Molded Long Glass Fiber Reinforced Polypropylene
| Content Provider | Semantic Scholar |
|---|---|
| Author | Teuwsen, Jan Goris, Sebastian Osswald, Tim |
| Copyright Year | 2017 |
| Abstract | The deformation of the material during injection molding of fiber filled composites causes a processinduced change in the fiber configuration. The local fiber orientation, fiber concentration, and fiber length within the molded part varies in thickness direction and along the flow path. This heterogeneous fiber microstructure inevitably results in anisotropic and locally varying mechanical properties. This paper presents a detailed experimental analysis of the microstructure of long glass fiber reinforced polypropylene (PP) plates and its influence on the mechanical properties. Large and thin center-gated plates are injection molded with three different nominal fiber concentrations (20, 40, and 60 wt%) and an initial fiber length of 15 mm. The analysis comprises local fiber orientation, fiber concentration, and fiber length measurements conducted by means of advanced measurement techniques, including micro-computed tomography (μCT) and digital image processing. Tensile test results reveal the correlation between the processinduced fiber configuration and the mechanical properties. The results of this experimental study verify a distinct seven-layered fiber orientation pattern for industry relevant nominal fiber concentrations. Besides a nominal fiber concentration and flow length dependent reduction of the average fiber length, the measurements suggest a non-uniform fiber orientation and fiber concentration distribution through the part thickness and along the flow path. Tensile test results show that tensile modulus increases with nominal fiber concentration, whereas tensile strength does not increase above 40 wt%. The process-induced fiber configuration causes a larger degree of anisotropy of the mechanical performance in high fiber-filled components (40 wt% and 60 wt%). |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://leaders.4spe.org/spe/conferences/ANTEC2017/papers/366.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
