A dissertation submitted to the Faculty of Engineering and the Built Environment,
University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the
degree of Master of Science in Engineering.
Johannesburg, October 2017 / This research looks into the manufacturing process of complex geometries using continuous
fibre reinforced thermoplastics (CFRTP). The purpose of this work was to develop methods
that will enable the production of defect free complex components.
This was achieved by investigating the key process parameters in the CFRTP manufacturing
process, and optimizing them in order to improve the quality of components. The investi-
gations were performed with the aid of software making use of the finite element method,
and this was found to be instrumental in predicting the formability of geometries. The re-
search showed that the formability of complex geometry is largely determined by the ability
of the laminate to be draped into the required geometry. The forming mechanisms that take
place during the draping process can be linked to the formation of defects where draping is
unsuccessful.
The study also showed that the quality of the drape can be influenced by blank and tool design
factors. It was also shown that the blank can be manipulated using a restraint mechanism to
improve the formability of geometries. The effect of processing parameters such as forming
speed, forming pressure and tool temperature were also investigated. The research resulted
in the formulation of guidelines to follow when manufacturing CFRTP components. The
developments that were made were successfully implemented to improve the formability of a
complex component that had previously been difficult to form without defects. / MT2018
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:wits/oai:wiredspace.wits.ac.za:10539/24191 |
| Date | January 2017 |
| Creators | Mashau, Shivasi Christopher |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | Online resource (xvii, [275] leaves), application/pdf |
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