Английски език
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.
