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Title of article :
Non-isothermal preform infiltration during the vacuum-assisted resin transfer molding (VARTM) process
Author/Authors :
M. Grujicic، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
Pages :
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Abstract :
A control-volume finite-element model is developed to analyze the infiltration of a fiber preform with resin under nonisothermal conditions within a high-permeability resin-distribution medium based vacuum-assisted resin transfer molding (VARTM) process. Due to the exposure to high temperatures during preform infiltration, the resin first undergoes thermalthinning which decreases its viscosity. Subsequently however, the resin begins to gel and its viscosity increases as the degree of polymerization increases. Therefore, the analysis of preform infiltration with the resin entails the simultaneous solution of a continuity equation, an energy conservation equation and an evolution equation for the degree of polymerization. The model is applied to simulate the infiltration of a rectangular carbon fiber based preform with the NBV-800 epoxy resin and to optimize the VARTMprocess with respect to minimizing the preform infiltration time. The results obtained suggest that by proper selection of the ramp/hold thermal history of the tool plate, one can reduce the preform infiltration time relative to the room-temperature infiltration time. This infiltration time reduction is the result of the thermal-thinning induced decrease in viscosity of the ungelled resin.
Keywords :
Modeling and simulations , Vacuum-assisted resin transfer molding (VARTM) process
Journal title :
Applied Surface Science
Journal title :
Applied Surface Science
Serial Year :
Link To Document :