In-operando dynamic visualization of flow through porous preforms based on X-ray phase contrast imaging

In-operando dynamic visualization of flow through porous preforms based on X-ray phase contrast imaging

Teixidó, Helena (Swiss Federal Institute of Technology)
Caglar, Baris (TU Delft Aerospace Manufacturing Technologies; Swiss Federal Institute of Technology)
Revol, Vincent (CSEM SA)
Michaud, Véronique (Swiss Federal Institute of Technology)

2021

Direct visualization is often sought to elucidate flow patterns and validate models to predict the filling kinetics during processes whereby a liquid resin infiltrates a textile porous preform. Here, X-ray phase contrast interferometry is evaluated to image in-operando constant flow rate impregnation experiments of a model fluid into glass, carbon and flax fabrics and a 3D printed structure. A methodology is presented to build the dynamic saturation curve based on image analysis of the dark field images, in which the pixel intensity values are transformed into saturation level versus position and time. The results prove the suitability of this technique to observe the progressive saturation averaged through the thickness of translucent and non-translucent preforms. The porosity network formed by the layers of fabric, the refractive properties of the material, the fabric geometry and its position relative to the X-ray setup are reported to be the main parameters affecting image contrast.

A. Fabric/Textiles
D. Process Monitoring
E. Liquid Composite Molding
E. Resin Flow

http://resolver.tudelft.nl/uuid:fcbe01a5-b299-4c13-8891-e4e8bc9c14a6

https://doi.org/10.1016/j.compositesa.2021.106560

1359-835X

Composites Part A: Applied Science and Manufacturing, 149

Institutional Repository

journal article

© 2021 Helena Teixidó, Baris Caglar, Vincent Revol, Véronique Michaud