دانلود پایان نامه انگلیسی کارشناسی ارشد دربارۀ Modeling of Resin Transfer Molding of Composite Materials

The goal of this research was to develop a computer model for the treatment of
Resin Transfer Molding (RTM) of unidirectional layer stranded fabrics oriented in
various directions. The individual fabric layers contain high fiber volume fraction
strands, separated by channels, which the model includes as separate phases. A finite
difference approximation has been developed to determine the effective permeability of
the channels. This approximation is based on classical channel flow equations, and is
applied to all three directions of the channels. The axial permeability in the strands has
been measured. The transverse permeabilities in the strands are assumed to be equal, and
are fitted to the model results.
The model consists of a finite difference routine which uses cell centered grids to
approximate the geometry of the reinforcement. The moving boundary resin is treated
with as constant pressure condition. The injection and vent ports are also modeled as
constant pressure conditions.
The model has been correlated with experimental results. Simulations and
experiments have been run using a single fabric layer at 0
, two layers at ±45
, and three
layers at 45
/0
/-45
and 0/±45
. The model accurately captures the flow front shape for
each case, and shows general agreement with the positions vs. time