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Aspects of modeling and simulation of vacuum assisted resin infusion

Vacuum Assisted Resin Infusion (VARI) is a technique for the production of fibre reinforced plastics. In this flow process a reactive resin system is infused in textile structures and then cured. Due to the complexity of the flow behaviour experience is necessary to estimate the production specific parameters. Flow simulation is a helpful tool for the design of the process.

The aim of the work is to model the flow behaviour in textile structures as a basis for flow simulation. It is focused on the modelling of the VARI process, taking into account the process specific constraints. The simulations should be performed with a reasonable effort of CPU-time in order to make them effective.

In the vacuum assisted resin infusion a dry textile structure is placed on a tool, covered with a vacuum bag and sealed. As a result of evacuating the setup the textile is compressed. The created pressure difference is the main driving force for the impregnation of the fibres. During the process the compression changes locally due to varying components in the force balance, having a strong influence on the flow. For the impregnation of large structures the use of a flow distribution medium is necessary. Placed on the fibre reinforcement it allows a fast and wide distribution and so it has a key role in the process.

In this work new methods are presented in modelling the process and measuring the permeability of the flow distribution medium. These are implemented in simulation tools. With an error of about 5%, the comparison of simulation and validation experiments shows a good agreement.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Florian Klunker

Florian Klunker
Lehrstuhl für Polymerwerkstoffe und Kunststofftechnik
Technische Universität Clausthal

Information

Free keywords: Fließsimulation, Permeabilität, Fließhilfe
Institute / chair: Fakultät für Natur- und Materialwissenschaften der Technischen Universität Clausthal
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Gerhard Ziegmann (Betreuer), Prof. Dr.-Ing. Gunther Brenner, Prof. Dr.-Ing. Axel Herrmann
Publication year: 2008
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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