Commingled composites are stronger than those manufactured with the standard manufacturing method. The objective of the thesis is to answer why that is, to investigate the microstructure of the composites, to model composite strength and compare experimental values with theoretical for composites having poly lactic acid (PLA) as matrix material and composites having poly propylene (PP) as matrix material. X - Ray micro - computed tomography was used to investigate the micro structure of the composites. Input from X - Ray micro - computed tomography was used to show that commingled PLA composites are stronger than standard PLA composites because the fibers are longer and more of them are orientated closer to the loading direction. Composites having PP as matrix material have lower strength than composites with PLA as matrix material. The strength for these composites is pretty much the same regardless of manufacturing method but still a little higher for commingled PP composites. Theoretical strength is modelled with the modified rule of mixture and correlates well with experimental values, having an R2 value of 0.95 for average composite strength.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:ltu-68430 |
| Date | January 2018 |
| Creators | Jagunic, Predrag |
| Publisher | Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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