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        Impact Behavior of Carbon Fiber/Epoxy Composites and Fiber Metal Laminates with Open Holes

        Carlos Rubio-González,Fabiola Chávez,Eduardo José-Trujillo,Julio A. Rodríguez-González,Alberto Ruiz 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3

        This paper describes an experimental investigation performed to evaluate the low-velocity impact behavior ofprepreg-based carbon fiber reinforced polymers (CFRPs) and fiber metal laminates (FMLs) with and without open holessubjected to different impact energies. The laminates were made of carbon fiber/epoxy prepregs and aluminum layers andmanufactured by using autoclave. The impact responses of these laminates were experimentally obtained using a drop-weighttower at impact energies of 15, 20 and 30 J. After testing, the impact damage area of tested specimens was quantified from Cscanultrasonic technique. In addition, an X-ray tomography analysis was performed to assess the through-thicknessdistribution of damage in FMLs with and without open holes. The results showed that the woven FMLs exhibit the highestimpact peak force compared to that of CFRP plates due to the presence of aluminum layers, which induce a higherdeformation capability to the laminates. The presence of open holes in laminates tends to augment their damage extensionand decreases their impact peak force due to the local stress concentration effect. Nevertheless, it was observed by C-scanultrasonic images that the aluminum layers reduce the extent of delamination of laminates during the impact event. Postimpactevaluation using X-ray computed tomography showed that impact causes a severe damage to the laminates aroundtheir impact point and confirmed that matrix cracking and delamination are the principal damage mechanisms induced on thethrough-thickness direction of the FML plates. In specific, the results confirm that the aluminum layers provide good impactproperties and damage resistance when they are added to the CFRPs.

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