Dual-scale visualization of resin flow for liquid composite molding processes
Helena Teixidó (École Polytechnique Fédérale de Lausanne)
B. Caglar (TU Delft - Aerospace Manufacturing Technologies)
V. Michaud (École Polytechnique Fédérale de Lausanne)
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Abstract
Visualization of resin flow progression through fibrous preforms is often sought to elucidate flow patterns and validate models for filling prediction for liquid composite molding processes. Here, conventional X-ray radiography is compared to X-ray phase contrast technique to image in-situ constant flow rate impregnation of a non-translucent unidirectional carbon fabric. X-ray attenuation of the fluid phase was increased by using a ZnI2-based contrasting agent, leading to enough contrast between the liquid and the low density fibers. We proved the suitability of conventional X-ray transmission to visualize fluid paths by elucidating different flow patterns, spanning from capillary to viscous regimes and a macro-void entrapment phenomenon
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