Measurement of void collapse during resin transfer moulding

This paper considers the dissolution of cylindrical voids trapped between fibres during the resin transfer moulding process. To study the behaviour of the tiny voids, a system is used which consists of a transparent mould loaded with a glass fibre reinforcement. The mould is placed under a microscop...

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Bibliographic Details
Published in:Composites. Part A, Applied science and manufacturing Applied science and manufacturing, 1997, Vol.28 (3), p.201-214
Main Author: Lundstrom, T S
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Fluid Mechanics
Injection moulding
Machinery and processing
micro-mechanics
Moulding
optical microscopy
Plastics
Polymer industry, paints, wood
polymer matrix composites
porosity
resin transfer moulding
Strömningslära
Technology of polymers
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Summary:This paper considers the dissolution of cylindrical voids trapped between fibres during the resin transfer moulding process. To study the behaviour of the tiny voids, a system is used which consists of a transparent mould loaded with a glass fibre reinforcement. The mould is placed under a microscope and a small area of the preform is monitored during the injection of a vinylester resin. The length of the voids decreases at a relatively fast rate and they disappear in the order of minutes due to diffusion. The experimental results are rationalized through a theory showing how certain parameters influence the rate of dissolution. The investigation shows the significance of degassing the resin before injection. This is especially important when low pressures are utilized during injection.
ISSN:1359-835X
1878-5840
1878-5840
DOI:10.1016/S1359-835X(96)00109-1