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RISS 인기검색어
- 검색키워드
- 저자 : Ahmet Avcı (검색결과 2 건)
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Ugur Köklü,Okan Demir,Ahmet Avcı,Ayhan Etyemez 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.10
Functionally graded composite (FGC) materials are categorized as advanced materials that display different thermal and mechanical responses compared with well-known composites, such as carbon fiber or glass fiber-reinforced composites. This paper presents the experimental results for the drilling of three materials, namely glass/epoxy, carbon/epoxy, and FGC material. FGC was compared with carbon and glass/epoxy composites in terms of thrust force, delamination factor, diameter of hole, and roundness during drilling. This study illustrated that the drilling performance of FGC is considerably more complicated than that of more common composite materials, such as glass/epoxy and carbon/epoxy. Delamination factor at the exit of hole during drilling of FGC was mainly affected by the material placed at the exit of the hole. The proposed cutting parameters and drill geometries to minimize the occurrence of delamination during drilling of carbon/epoxy and glass/epoxy apparently does not meet the expectation in drilling FGC.
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Hasan Ulus,Halil Burak Kaybal,Volkan Eskizeybek,Ahmet Avcı 한국섬유공학회 2019 Fibers and polymers Vol.20 No.10
In this study, we report the effect of halloysite nanotube (HNT) modification on salty water aging durability ofepoxy (Ep)/basalt fiber (BF) hybrid composites. For this, various amounts of HNTs were introduced into the Ep matrix, andthe HNTs/Ep mixture was used to impregnate basalt fabrics to fabricate hybrid laminated composites. The hybrid compositeswere exposed substantial increases in the tensile strength and the fracture toughness. Besides, after salty water aging for 6months, the hybrid composites exhibited remarkably improved aging performance with almost 10 % less reduction in bothtensile and flexural strengths and fracture toughness compared to the neat basalt-epoxy composites. SEM analysis showedrelatively less number of cracks, micro-voids and better interfacial bonding for the 2 wt% HNTs reinforced hybrid compositespecimens in comparison to the neat counterpart, similarly conditioned in all cases. The consequences of salty water aging onmicro-scale morphology were discussed based on the fracture morphologies to reveal degradation mechanisms in theexistence of HNTs reinforcement.
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