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Demiral, Murat

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https://hdl.handle.net/20.500.12416/9443
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Demiral, M.
Job Title
Doç. Dr.
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Main Affiliation
06.06. Makine Mühendisliği
Makine Mühendisliği
06. Mühendislik Fakültesi
01. Çankaya Üniversitesi
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Former Staff
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Sustainable Development Goals

13

CLIMATE ACTION
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8

DECENT WORK AND ECONOMIC GROWTH
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3

GOOD HEALTH AND WELL-BEING
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15

LIFE ON LAND
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17

PARTNERSHIPS FOR THE GOALS
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LIFE BELOW WATER
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4

QUALITY EDUCATION
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SUSTAINABLE CITIES AND COMMUNITIES
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CLEAN WATER AND SANITATION
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REDUCED INEQUALITIES
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9

INDUSTRY, INNOVATION AND INFRASTRUCTURE
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RESPONSIBLE CONSUMPTION AND PRODUCTION
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AFFORDABLE AND CLEAN ENERGY
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PEACE, JUSTICE AND STRONG INSTITUTIONS
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Scholarly Output

7

Articles

3

Views / Downloads

563/13

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WoS Citation Count

39

Scopus Citation Count

51

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3

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3

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WoS Citations per Publication

5.57

Scopus Citations per Publication

7.29

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2

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JournalCount
Modelling and Simulation in Materials Science and Engineering2
Advanced Machining Processes: Innovative Modeling Techniques1
AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2018 -- AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2018 -- 8 January 2018 through 12 January 2018 -- Kissimmee -- 2100491
Applied Nanoindentation in Advanced Materials1
Applied Nanoindentation İn Advanced Materials1
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Now showing 1 - 7 of 7
  • Thumbnail Image
    Article
    Citation - WoS: 4
    Citation - Scopus: 7
    Enhanced Gradient Crystal-Plasticity Study of Size Effects in a Β-Titanium Alloy
    (Iop Publishing Ltd, 2017) Nowag, Kai; Roy, Anish; Ghisleni, Rudy; Michler, Johann; Silberschmidt, Vadim V.; Demiral, Murat
    A 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.
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    Article
    Modelling and simulations of nanoindentation in single crystals
    (John Wiley and Sons LTD., 2017) Liu, Qiang; Demiral, Murat; Roy, Anish; Silberschmidt, Vadim V.
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    Conference Object
    A Study of the Structural and Mechanical Characterization of Hybrid Nanocomposite Material
    (Trans Tech Publications Ltd, 2017) Al-Nassar, S.I.; Demiral, M.; Kadhim, H.M.; Mahmoud, A.K.
    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.
  • Thumbnail Image
    Book Part
    Citation - Scopus: 1
    Finite Element Modeling of Mechanical Micromachining
    (CRC Press, 2017) Demiral, M.; Oliaei, S.N.B.
    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.
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    Conference Object
    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) Demiral, M.; Avil, E.; Ercan, M.E.; Aydoğan, T.; Kadioglu, F.
    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.
  • Thumbnail Image
    Book Part
    Citation - WoS: 3
    Citation - Scopus: 3
    Modelling and Simulations of Nanoindentation in Single Crystals
    (John Wiley & Sons Ltd, 2017) Liu, Qiang; Demiral, Murat; Roy, Anish; Silberschmidt, Vadim V.
    Modelling 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.
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    Article
    Citation - WoS: 32
    Citation - Scopus: 37
    Void Growth in High Strength Aluminium Alloy Single Crystals: a Cpfem Based Study
    (Iop Publishing Ltd, 2017) Siddiq, M. Amir; Demiral, Murat; Asim, Umair
    High 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.