### Abstract

A model to predict the permeability of Non-Crimp Fabrics is proposed. The model is based on the geometrical features of the fabric. The stitches penetrating the uni-directional plies of the NCF induce distortions in the plane of the fabric. The dimensions of these Stitch Yarn induced fibre Distortions (SYD) are analysed for different fabrics in relaxed and sheared configurations. The length and width of the SYDs are found to be distribution values. The averaged value and the distribution change as the fabric is sheared.
The SYDs form flow channels, which determine the permeability of the NCF. The channels are connected to each other in overlap regions, allowing the fluid to flow from one channel to another and finally to impregnate the entire preform. A network of SYD flow channels is modelled to account for the statistical variations in the dimensions of the SYDs. The flow resistance of a single channel is calculated using a multigrid solver. The global flow is calculated by solving the effective resistance of all flow channels. Analysis of different networks, with varying spatial distribution of the dimensions of the flow channels, allows the prediction of the variation in the permeability of an NCF.

Original language | Undefined |
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Title of host publication | Proceedings of European Conference on Composite Materials (ECCM-11) |

Editors | C. Galiotis |

Pages | - |

Number of pages | 10 |

Publication status | Published - 2004 |

Event | 11th European Conference on Composite Materials, ECCM 2004 - Rodos, Greece Duration: 31 May 2004 → 3 Jun 2004 Conference number: 11 |

### Conference

Conference | 11th European Conference on Composite Materials, ECCM 2004 |
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Abbreviated title | ECCM |

Country | Greece |

City | Rodos |

Period | 31/05/04 → 3/06/04 |

### Keywords

- METIS-221570
- IR-70024

## Cite this

Loendersloot, R., ten Thije, R. H. W., Akkerman, R., & Lomov, S. V. (2004). Permeability prediction of non-crimp fabrics based on a geometric model. In C. Galiotis (Ed.),

*Proceedings of European Conference on Composite Materials (ECCM-11)*(pp. -)