Wetting of fiber mats for composites manufacturing: I. Visualization experiments

Yung‐Tin ‐T Chen, H. Ted Davis, Chris Macosko

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

Wetting of glass fibers was visualized using an oil with the same refractive index. With both a video‐enhanced microscope and a high‐magnification video camera we followed the flow front and qualitatively measured the entrapped air bubbles by image analysis. Due to different permeabilities between the fiber mats and bundles, air bubbles are entrapped. Two major kinds of air bubbles are observed: small cylindrical micro voids between fiber filaments (inside fiber bundles) and spherical macro voids outside fiber bundles. These air bubbles can be described by three major mechanisms initial liquid bypassing/air trapping, later capillary invasion of disordered fiber bundles, and air bubble mobilization. Both random and unidirectional fiber mats were used in this study. Vacuum as well as different fluid viscosities and surface tensions were also investigated, which led us to guidelines of optimum processing parameters of fiber wetting for resin transfer molding and structural reaction injection molding. They are low viscosity, vacuum, high mold temperature, and high pressure.

Original languageEnglish (US)
Pages (from-to)2261-2273
Number of pages13
JournalAIChE Journal
Volume41
Issue number10
DOIs
StatePublished - Oct 1995

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