Compression after Impact and Charpy Impact Characterizations of Glass Fiber/Epoxy/MWCNT Composites
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ISSN 1229-9197 (print version) ISSN 1875-0052 (electronic version)
Compression after Impact and Charpy Impact Characterizations of Glass Fiber/Epoxy/MWCNT Composites Özgür Demircan1,2*, Kemal Kadıoğlu2, Pınar Çolak2, Erdinç Günaydın2, Mustafa Doğu3, Neslihan Topalömer3, and Volkan Eskizeybek4 1
Nanoscience and Nanotechnology Department, Graduate School of Science, Ondokuz Mayıs University, Samsun 55139, Turkey 2 Metallurgical and Materials Engineering Department, Faculty of Engineering, Ondokuz Mayıs University, Samsun 55139, Turkey 3 Mir Research and Development A.Ş., Istanbul 34522, Turkey 4 Department of Materials Science and Engineering, Canakkale Onsekiz Mart University, Canakkale 17020, Turkey (Received August 23, 2019; Revised December 7, 2019; Accepted December 16, 2019) Abstract: In this study, glass fiber/epoxy resin/multi-walled carbon nanotubes (MWCNTs) were used to fabricate hybrid composites with biaxial warp-knitted fabrics. The biaxial warp-knitted fabrics were grafted with various amounts of MWCNTs and the hybrid composites were fabricated using the resin transfer molding (RTM) method, subsequently. The fabricated samples were subjected to compression after impact and Charpy impact tests. The hybrid composites exhibited higher compression after impact modulus and strength with 26 % and 17 % compared to the samples without nanotubes, respectively. Moreover, the MWCNTs integrated specimens showed 17 % improvement of Charpy impact strength against specimens without carbon nanotubes in 0 o degree direction. Fracture surface analysis revealed lower number of cracks and shorter crack propagation lengths in the MWCNTs reinforced specimens. The improvement in mechanical properties of the hybrid composites can most likely be attributed to an increase in interfacial adhesion due to the presence of the carbon nanotubes. Keywords: Non-crimp fabric, Thermosets composites, Carbon nanotubes, Compression after impact and Charpy impact properties
epoxy systems that differ in the CNT dispersion and functionalization are used as a matrix material. Nanotubes are found to have a dual effect on composite properties; they improved the interlaminar fracture toughness and damage tolerance of the composite. Kostopoulos et al. [12] studied the impact and CAI properties of carbon fiber reinforced composites reinforced with multi-wall carbon nanotubes (about 0.5 wt %). The strength after impact and the effective compressive modulus after impact were improved for all the CNT doped specimens compared with the bare carbon/ epoxy composites. The enhancement of mechanical performance of epoxy/carbon fiber laminate composites using single-walled carbon nanotubes was reported by Ashrafi et al. [13]. It was found that incorporation of 0.1 wt% of SWCNT resulted in a 5 % reduction of the area of impact damage, a 3.5 % increase in CAI strength, a 13 % increase in Mode I fracture toughness, and 28 % increase in Mode II interlaminar fracture toughness. Ye et al. [14] reviewed interlaminar fracture toughness and CAI strength of fiber-rei
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