Demiral, Murat
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Doç. Dr.
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Makine Mühendisliği
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Former Staff
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Scholarly Output
7
Articles
6
Citation Count
45
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0
7 results
Scholarly Output Search Results
Now showing 1 - 7 of 7
Conference Object Citation - Scopus: 0A 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 MühendisliğiThis 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.Article Modelling and simulations of nanoindentation in single crystals(John Wiley and Sons LTD., 2017) Demiral, Murat; Demiral, Murat; Roy, Anish; Silberschmidt, Vadim V.; Makine MühendisliğiBook Part Citation - WoS: 2Citation - Scopus: 2Modelling and Simulations of Nanoindentation in Single Crystals(John Wiley & Sons Ltd, 2017) Demiral, Murat; Demiral, Murat; Roy, Anish; Silberschmidt, Vadim V.; Makine MühendisliğiModelling of micro-/nano-indentation of single crystals has been developed extensively to elucidate experimentally observed features such as the size effect, pile-up phenomenon and lattice rotations. The indentation size effect (ISE) of three types of single crystals, i.e. f.c.c. copper single crystal, b.c.c. ß phase of Ti-6Al-4V (ß-Ti-64) and b.c.c. ß phase of Ti-15V-3Cr-3Al-3Sn (ß-Ti-15-3-3-3), is investigated using finite-element analysis. In indentation modelling, an idealised conical indenter and spherical indenters were chosen to study the effects of indenter's geometry on the mechanical response of the tested material. A crystal plasticity model was used to describe the material's behaviour of these single crystals during nanoindentation. In this chapter, a conventional single-crystal plasticity (SCP) model and the mechanism-based strain-gradient crystal-plasticity (MSGCP) model were employed to compare and contrast the (de)merits of the types of crystal plasticity models. © 2017 John Wiley & Sons Ltd.Article Citation - WoS: 30Citation - Scopus: 35Void growth in high strength aluminium alloy single crystals: a CPFEM based study(Iop Publishing Ltd, 2017) Asim, Umair; Demiral, Murat; Siddiq, M. Amir; Demiral, Murat; Makine MühendisliğiHigh strength aluminium alloys that are produced through forming and joining processes are widely used in aerospace components. The ductile failure in these metals occurs due to the evolution and accumulation of microscopic defects, such as microvoids and shear bands. The present work investigates the underlying physical mechanisms during ductile failure by performing a rigorous, fully-validated, three-dimensional crystal plasticity, finite element study with aluminium alloy single crystals. Representative volume element (RVE) based simulations of single crystalline aluminium alloys (AA-5xxx) with different void geometries and orientations have been performed. Both local and nonlocal crystal plasticity constitutive models have been implemented in a finite element framework and are used to seek new insights into the interrelationships among void growth, initial porosity, initial void size, plastic anisotropy, and local/nonlocal size effects.Article Citation - WoS: 3Citation - Scopus: 6Enhanced gradient crystal-plasticity study of size effects in a beta-titanium alloy(Iop Publishing Ltd, 2017) Demiral, Murat; Demiral, Murat; Nowag, Kai; Roy, Anish; Ghisleni, Rudy; Michler, Johann; Silberschmidt, Vadim V.; Makine MühendisliğiA calibrated model of enhanced strain-gradient crystal plasticity is proposed, which is shown to characterize adequate deformation behaviour of bcc single crystals of a beta-Ti alloy (Ti-15-3-3-3). In this model, in addition to strain gradients evolving in the course of deformation, incipient strain gradients, related to a component's surface-to-volume ratio, is accounted for. Predictive capabilities of the model in characterizing a size effect in an initial yield and a work-hardening rate in small-scale components is demonstrated. The characteristic length-scale, i.e. the component's dimensions below which the size effect is observed, was found to depend on densities of polar and statistical dislocations and interaction between them.Book Part Citation - Scopus: 1Finite element modeling of mechanical micromachining(CRC Press, 2017) Oliaei, S.N.B.; Demiral, Murat; Demiral, M.; Makine MühendisliğiThe 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.Conference Object Citation - Scopus: 3Performance 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 MühendisliğiThe 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.
