Edge Treatment of Machined Damages of Fiber Reinforced Composites

K.A. Brauning, K. Arifa, M.M. Rahman and R. Asmatulu
Wichita State University, United States

Keywords: Fiber Reinforced Composites, Machining, Damage, Free Edge, Mitigations

Fiber reinforced composites have been used in a number of different industrial applications, such as aircraft, wind turbine, space, automotive, defense and many other manufacturing industries because of their high strength to weight ratio, low coefficient of thermal expansion, fatigue and corrosion resistance, ease of manufacturing larger parts, design flexibility and high temperature applications. During the manufacturing and machining (e.g., curing, cutting, terming, and drilling) processes of composites, some surface damages and free edges are formed around the composites. These defects on the fiber reinforced composites are considered to be major flaws and can reduce overall mechanical properties of those composites. In this study, pre-preg carbon fiber composite laminates were produced in a vacuum oven at different fiber orientations and then test coupons were extracted from the prepared composite panels. Two different edge treatment adhesives (cyano-acrolate adhesive and epoxy resin) were applied on the machined sides of the composite surfaces prior the tensile tests. The test results indicated that edge treatments could improve the mechanical properties of the composites more than 10%. This may be useful for the future design of composite products for different industrial applications.