The analysis of effect and calculation of optimum amount of pressure difference on the total time of injection for making fiberglass vessels by VIP method in theoretical, numerical and experimental methods

Nowadays, most high speed and big vessels are made of fiberglass. These materials are replaced with metals because of their better resistance against corrosion, higher strength rate per weight and easier shaping. Most of these vessels are made with hand layup method. To achieve a higher quality these traditional methods must be replaced with more appropriate methods. One of these modern methods is vacuum infusion process (VIP) which reduces the weight and removes the bubbles in final product and causing better strength than the hand layup method. In this method of fabrication process, there are different parameter effecting the time and quality of resin injection. This research includes the effect of actual pressure difference in theoretical, numerical and experimental methods. At the end, after investigating the parameters, it is proven that the optimized pressure different, must be calculated to reach the minimum injection time. In lower pressure difference, numerical and theoretical results are better matched with the experimental results, while in higher ΔP the results are different.