Vakum infüszyon yönteminde 1B ve 2B reçine akışı için kalınlık varyasyonunu azaltmak

In the Vacuum Infusion (VI) process, the thickness of a composite part changes as the resin pressure, and thus the compaction pressure changes as a function of spatial coordinates and time since the upper mold part is a non-rigid vacuum bag. To manufacture composite parts with small tolerances in thickness, one must know the coupled effect between the resin flow and fabric compaction.For 1D experiments, pressure and thickness were monitored along resin flow using pressure transducers and non-contact laser displacement sensors. For 2D experiments, thickness was monitored at multiple points using a scanning non-contact laser displacement sensor. To decrease the thickness variation in the controlled version of the repeated VI experiments, some control actions were taken by adjusting the injection boundary conditions such as opening/closing injection gates and ventilation ports and changing their pressures in the post-mold filling stage. The control actions were taken based on an available decompaction database for the fabric type used in this study. For 1D experiments, of a conventional VI process, maximum percentage thickness variation was measured as 5.44%. By applying control actions in post filling stage, the maximum percentage variation was decreased to 0.34%. For 2D experiments, uncontrolled experiments yielded 34.3% maximum thickness variation. Controlled experiments had 7.3% maximum thickness variation. This study concludes that by applying control actions at post filling stage, composite parts with considerably reduced thickness variation can be manufactured. Control Actions must be taken based on compaction and permeability databases constructed in material characterization experiments.