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Three-Dimensional Numerical Simulation of Mold-Filing and Void Formation During Vacuum-Assisted Resin Transfer Molding  

강문구 (서울대학교 전기컴퓨터공학부)
배준호 (서울대학교 기계공학)
이우일 (서울대학교 기계항공공학부)
Publication Information
Composites Research / v.17, no.3, 2004 , pp. 1-7 More about this Journal
Abstract
In the vacuum assisted RTM (VARTM) process that has become the center of attention for manufacturing massive composite structures, a good evacuation of air in the fiber preform is recognized as the prime factor. The microvoids, or the dry spots, are formed as a result of improper gate/vent locations and the mold geometry. The non-uniform resin velocity at the flow front leads to the formation of microvoids in the fibers, whereas the air in the microvoids can migrate along with the resin flow during mold filling. The residual air in the internal voids of a composite structure may cause a degradation of the mechanical properties as well as the structural failure. In this study, a unified macro- and micro analysis methods were developed to investigate the formation and transport of air in resin during VARTM process. A numerical simulation program was developed to analyze the three-dimensional flow pattern as well as the macro- and microscopic distribution of air in a composite part fabricated by VARTM process.
Keywords
VARTM; Macroscopic voids; Microscopic voids;
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