Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 42, Issue 6, Pages 658-668Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2011.02.005
Keywords
Polymer-matrix composites (PMCs); Defects; Numerical analysis; Liquid composite molding (LCM)
Funding
- French Ministry of Economy, Finance and Industry
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We propose modeling and simulation of the void formation and the tow saturation in liquid composite molding processes. The present model addresses the void formations in the macropore between fiber tows as well as in the micropore inside fiber tows. We also consider the bubble compression and tow saturation after voids are formed at the flow front. Finally, a void migration model is considered. The present models are validated by a comparison between simulation results and experimental data. The simulation results successfully represent important features of the void physics: the correlation of void formation at the flow front with capillary number, the advantage of vacuum application at air vents to reduce the void content inside tows, and the existence of partially saturated zone behind the global flow front. The representation of mold filling patterns by a degree of saturation shows the presence of a bubbly zone behind the flow front. (C) 2011 Elsevier Ltd. All rights reserved.
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