Browsing by Author "Demiral, M."

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Citation - Scopus: 0
A Study of the Structural and Mechanical Characterization of Hybrid Nanocomposite Material
(Trans Tech Publications Ltd, 2017) Mahmoud, A.K.; Demiral, Murat; Al-Nassar, S.I.; Demiral, M.; Kadhim, H.M.; Makine Mühendisliği
This work is devoted on the synthesized new hybrid nanocomposite materials by using mechanical stirring method through a combination of different types of material; epoxy based matrix and nanofiller (TiO2 nanoparticles) as a reinforcement material. In additional this paper studies the effect of TiO2 nanoparticles with percentage 2-8 wt% added to epoxy based matrix on the mechanical properties (tensile properties and hardness property). The results showed that the tensile strength of nanocomposite material increased gradually by increasing the weight percentage of TiO2 nanoparticles from 2 wt % to 8 wt % TiO2, while the best tensile strength was at 8 wt % TiO2. The maximum value of tensile strength was 270% higher than the neat epoxy matrix. The hardness increase gradually with increasing percentage of TiO2 nanoparticles from 2wt% TiO2 up to 8wt% TiO2, the maximum value of hardness was at 8wt % TiO2, so the hardness of nanocomposite is around 86% higher than the neat epoxy matrix. © 2017 Trans Tech Publications, Switzerland.
Citation - Scopus: 1
Finite element modeling of mechanical micromachining
(CRC Press, 2017) Oliaei, S.N.B.; Demiral, Murat; Demiral, M.; Makine Mühendisliği
The knowledge about all these phenomena is necessary to fabricate microparts, satisfying required dimensional and geometrical tolerances and surface quality requirements. Therefore, developing predictive techniques to improve the quality of microparts has emerged as an important research area. Several approaches have been used to predict outputs of microcutting operations including analytical modeling, numerical techniques, molecular dynamics simulation, and experimental studies. As experimental studies are costly and time consuming and as they are only valid for the conditions and range of machining parameters used in the experiments, numerical methods are used as an alternative method to predict machining process outputs. © 2018 by Taylor & Francis Group, LLC.
Citation - Scopus: 3
Performance of adhesively-bonded joints of laminated composite materials under different loading modes
(American Institute of Aeronautics and Astronautics Inc, AIAA, 2018) Kadioglu, F.; Demiral, Murat; Demiral, M.; Avil, E.; Ercan, M.E.; Aydoğan, T.; 205907; Makine Mühendisliği
The aim of this work is to investigate quasi-static performance of adhesively-bonded joints with adherends manufactured from a laminated composite material under tensile and bending loading modes. For this purpose, a film adhesive, AF163-2K, produced by 3M, and a glass fiber reinforced polymer matrix composite, Hexply 913/33%/UD280, produced by Hexcel were used. In the current work, numerical analysis of the joints was carried out using ABAQUS/Standard finite element program, and also a series of experimental studies were conducted. While the thickness of the adherends and the adhesive layer were kept constant, 2 mm and 0.200 mm, respectively, the composite adherends with 10 layers for different fiber orientations - 10°, 20°, 45° and 55° (symmetric and balanced) – and for different overlap lengths, 15 mm, 25 mm and 40 mm, were considered. Our results showed that failure mechanisms in the joints was different from each other for different loading modes. Numerically obtained stress distributions in the joints and composites give insight into the experimentally obtained results. © 2018 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.