Evaluation of fiber preform permeability tensor considering flow inlet finite size

Viktor Grishaev, Oleg V. Lebedev, Sergey G. Abaimov, Iskander S. Akhatov

    Research output: Contribution to conferencePaperpeer-review

    Abstract

    To manufacture high-performance fiber-reinforced polymers using liquid composite molding it is necessary to have a deep understanding of the fiber preform filling process and, therefore, of its parameters. This is important because such parameters are used in numerical simulations of the resin flow during the filling process. One of the parameters that determines the process is the permeability of the fibrous preform. In spite of the fact that permeability has been studied by many researchers, there are divergences of experimental results provided by different methods. Therefore, to help to standardize permeability measurements, two international benchmark exercises were conducted. Although the results of these benchmarks were promising, further steps to standardize the measurement procedure were required. In the context of the 2017 benchmarks (one on the in-plane permeability, one on the out-of-plane permeability), an experimental setup was developed to measure all components of a permeability tensor. The crucial aspect of our study is that the theoretical method developed earlier was implemented to predict values of both in-plane and out-of-plane permeability. This method takes into account the finite size of the inlet gate (when the thickness of the preform is equal to the inlet's diameter or smaller). To develop the method further, in our study we observed flow front pattern of the silicon oil on both sides of the preform and used this information for the evaluation of the permeability components. We analyzed the permeability for different layups of the preform changing thereby both the compression pressure on the preform and the volume fraction of fibers. To test the response of the preforms on different values of the compression pressure, load relaxations were monitored for both dry and wet states of the preforms.

    Original languageEnglish
    Publication statusPublished - 2017
    Event21st International Conference on Composite Materials, ICCM 2017 - Xi'an, China
    Duration: 20 Aug 201725 Aug 2017

    Conference

    Conference21st International Conference on Composite Materials, ICCM 2017
    Country/TerritoryChina
    CityXi'an
    Period20/08/1725/08/17

    Keywords

    • Flow modeling
    • Liquid composite molding (LCM)
    • Permeability
    • Textile preform

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