| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 101 === Composite materials are widely used in many applications, not only in the aerospace industry but also in the marine, automotive, sports goods industries. In many examples surface characteristic is critical, or at least important, since it reduces skin friction, drag and fuel consumption, in addition, a good surface appearance is a cosmetic necessity. Besides, fiber volume fraction is an important indicator of composites property. The fiber is used to reinforce material which is the main part in composite to bear the load. While the fiber volume fraction is low, the resin will break with too much loading and hence the composite will be damaged.
The Toray T300-3K and Huntsman AralditeRLY556 epoxy resin, AradurR917 hardener, DY070 accelerator was used and applying hand lay-up process and hot compress vacuum bag to make composite. Then, investigate the influence of curing parameter on the surface characteristic and fiber volume fraction.
It shows that there will be many porosity in the resin-rich area of the woven fiber –reinforced composite. The curing pressure and the heating rate both have effect on the surface porosity and heating rate is the most influential factor. The higher heating rate raise the cross-linking rate prior to gel and cause higher viscosity, lower resin flow as a result of surface porosity entrapment. The higher heating rate reduce the fiber volume fraction because of the high cross-linking rate prior to gel, which leads to low resin flow and restricted resin which can’t be squeezed out by compressing in the composite.
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