Composite materials have wide range of usages. They also hold a big potential for composing newer types of materials with improved mechanical properties due to the hybridization of different materials. In industrial applications, making holes into composite laminates is an important part of the production process. Piercing is a very commonly used shearing process that is used to cut predetermined shapes from sheets and laminates. In this study, woven hybrid composites consist of woven aramid and carbon fibers were pierced under different clearances by using a high-speed punch. Two types of hybrid composites were manufactured by Vacuum Assisted Resin Infusion Method and every hybrid composite had five layers of fibers. In hybridization process, first woven carbon (C), then woven aramid (A) fibers were placed at the center and the other fiber materials were inserted according to centered one, respectively. The sequences of hybrid composites were as C-A-C-A-C and A-C-A-C-A. The piercing process was performed under 3 clearances (1%, 5% and 10% of the material thickness) by using an Instron drop tower machine having 4 m/s punch speed and every single test were repeated 3 times and their average results were considered. The results showed that required piercing load was decreased when the clearance increases. It was also observed that more piercing load was required to pierce C-A-C-A-C sequenced woven hybrid composites than A-C-A-C-A sequenced ones.
Anahtar Kelimeler: Hybridization, Composites, Piercing, Woven carbon, Woven aramid
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