Investigation on the Mold Compressive Stage of Compression Resin Transfer Molding by Using In-situ Measurement of Permeability Variation of Fiber Preform

2019 ◽  
Vol 20 (3) ◽  
pp. 651-655 ◽  
Author(s):  
Dong Gi Seong ◽  
Jung Soo Kim ◽  
Moon Kwang Um ◽  
Doojin Lee
Keyword(s):  
Resin Transfer Molding ◽  
In Situ Measurement ◽  
Fiber Preform ◽  
Transfer Molding ◽  
Permeability Variation ◽  
Compression Resin Transfer Molding

scholarly journals In-Situ Void Content Measurements during Resin Transfer Molding

2014 ◽  
Vol 40 (1) ◽  
pp. 25-34 ◽  
Author(s):  
Ryosuke MATSUZAKI ◽  
Daigo SETO ◽  
Akira TODOROKI ◽  
Yoshihiro MIZUTANI
Keyword(s):  
Resin Transfer Molding ◽  
Void Content ◽  
Transfer Molding

Formation of Microscopic Voids in Resin Transfer Molded Composites

Materials ◽  
2003 ◽  
Author(s):  
Youssef K. Hamidi ◽  
Levent Aktas ◽  
M. Cengiz Altan
Keyword(s):  
Epoxy Composite ◽  
Resin Transfer Molding ◽  
Microscopic Analysis ◽  
Void Content ◽  
Fiber Preform ◽  
Composite Part ◽  
Transfer Molding ◽  
Average Size ◽  
Induced Defects ◽  
Fiber Preforms

Performance of composite materials usually suffers from process-induced defects such as dry spots or microscopic voids. While effects of void content in molded composites have been studied extensively, knowledge of void morphology and spatial distribution of voids in composites manufactured by resin transfer molding (RTM) remains limited. In this study, through-the-thickness void distribution for a disk-shaped, E-glass/epoxy composite part manufactured by resin transfer molding is investigated. Microscopic image analysis is conducted through-the-thickness of a radial sample obtained from the molded composite disk. Voids are primarily found to concentrate within or adjacent to the fiber preforms. More than 93% of the voids are observed within the preform or in a so-called transition zone, next to a fibrous region. In addition, viod content was found to fluctuate through-the-thickness of the composite. Variation up to 17% of the average viod content of 2.15% is observed through-the-thicknesses of the eight layers studied. Microscopic analysis revealed that average size of voids near the mold surfaces is slightly larger than those located at the interior of the composite. In addition, average size of voids that are located within the fiber preform is observed to be smaller than those located in other regions of the composite. Finally, proximity to the surface is found to have no apparent effect on shape of voids within the composite.

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