An experimental investigation on infusion time and strength of fiber metal laminates made by vacuum infusion process

Abstract

The vacuum infusion process can be used to fabricate fiber metal laminates with reduced manufacturing time and cost. In this method, the holes in the aluminum layers are created due to the better flow of the resin and to ensure that the fibers are completely impregnated. Created holes can cause problems in using these fiber metal laminates. For example, structural strength is reduced and some parts of the composite layers are exposed to environmental conditions. A proper solution to these problems has been proposed and investigated in this article. If a non-perforated aluminum layer is used as the first layer to be in contact with the mold, this layer becomes the outer layer of the structure made of fiber metal laminates. This non-symmetric fiber metal laminate will still be resistant to moisture and other environmental conditions due to the presence of an intact aluminum layer on the outermost layer, such as conventional fiber metal laminates. This aluminum layer also increases the strength of fiber metal laminates in comparison with fiber metal laminates that its all aluminum layers are perforated. In this paper, the effect of holes diameter of aluminum layers on the resin flow rate (consequently the duration of the fabrication) and the mechanical strength of the structure were investigated. The results showed that holes in the upper and middle layers of aluminum can significantly increase the speed of fabrication, but the presence of the holes causes a slight decrease in the final strength of the sample.

Bilayer AA7075-thermoplastic composite structures manufactured by hot pressing: Effect of glass fiber amount of polypropylene composite on mechanical properties

“…Glass fiber/metal laminates which comprise of alternating layers of aluminum (Al) alloy and fiber reinforced plastic composites with the trade name of GLARE were originally developed at Delft University. 29,30 FMLs have good moisture and corrosion resistance, 31 high specific strength and stiffness, 32 good impact and fatigue resistance 33 and low density achieves lighter structures compared to conventional metals, which makes a great contribution to fuel efficiency. 34 Resulting properties of hybrid structure are highly dependent on the manufacturing history as well as the component properties.…”