Vacuum-assisted resin transfer molding (VARTM), one of a commonly
used composite manufacturing processes, is becoming more popular.
To optimize the manufacturing process, reduce costs, and maintain
consistent part quality, knowledge of mold filling, especially flow
through thickness direction is required. This work investigates the
mechanism of the thickness variation dynamic change during the
infusion and curing/relaxing processes. A numerical model is
developed to track the thickness change of the bagging film free
surface. In addition, this work analyzes the sources of the
uncertainties and quantifies the magnitudes of the uncertainties by
error propagation theory to characterize the statistical properties
of the permeability values. Factors related to the part thickness
variation are identified with design of experiments method and a
better tooling design is obtained by configuring the different flow
media. The parameter uncertainty that leads to part-to-part
thickness variation is also investigated and a stochastic process
simulation coupled with optimization is effectively demonstrated.
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