Aslan, Özgür

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Name Variants
Özgür, Aslan
Aslan O.
Ö.,Aslan
A., Ozgur
Aslan, Özgür
Aslan,O.
O.,Aslan
Ozgur, Aslan
Aslan, O.
A., Özgür
Aslan,Ö.
A.,Ozgur
Ö., Aslan
O., Aslan
Aslan Ö.
A.,Özgür
Aslan, Ozgur
Job Title
Profesor Doktor
Email Address
ozgur.aslan@atilim.edu.tr
ORCID ID
0000-0002-1042-0805
Scopus Author ID
25521345500
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Scholarly Output

27

Articles

7

Citation Count

67

Supervised Theses

3

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2015 - 201922020 - 202421
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Scholarly Output Search Results

Now showing 1 - 10 of 23
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    Article
    Citation Count: 14
    Modeling and simulation of coupled phase transformation and stress evolution in thermal barrier coatings
    (Pergamon-elsevier Science Ltd, 2020) Sait, Ferit; Gurses, Ercan; Aslan, Ozgur; Mechanical Engineering; Aerospace Engineering
    The thermally grown oxide layer is known to be responsible for the failure of coating systems due to the generation of severely high stresses. In this work, oxidation induced stresses generated in thermal barrier coating (TBC) systems are investigated for high temperature isothermal oxidation. In that sense, a comprehensive model, where phase transformation is coupled with mechanics is developed for the life-time estimation of TBC systems and a modified version of the Allen-Cahn type phase field approach is adopted in order to model the generation of thermally grown oxide (TGO) in finite strain constitutive framework. The top-coat material behavior is modeled using a rate-dependent Gurson type plasticity for porous materials which also accounts for creep. The results for the isothermal phase transformation analysis and the model validation using experimental results are demonstrated. The capability of the model in predicting the local stresses which is the main variable in the analysis of possible delaminations and accurate lifetime estimation of TBC systems is shown.
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    Conference Object
    Citation Count: 0
    Toughening Mechanism of Recycled Rubber Based Composites Reinforced with Glass Fibers + Alumina Fibers for Military Applications
    (Springer, 2022) K-Çakır,G.; Aslan,Ö.; Bayraktar,E.; Mechanical Engineering
    Military grade composites are used in many different applications for their low weight to protect the equipment from harm or destruction. In this research, low-cost devulcanized recycled rubber based composites were designed with short glass fibers + glass bubbles reinforcements. After determination (in wt% percentages) of the reinforcements with matrix, a special process was applied to complete successfully the manufacturing of these composites (silanization of the recycled rubber and devulcanization before blending it with epoxy resin and reinforcement). All of the details of these processes were given in former papers (Irez et al., Materials 12:2729, 2019; Irez et al., Polymers 12:448, 2020; Irez et al., Mechanics of composite and multi-functional materials, Springer, pp 59–70, 2017; Irez and Bayraktar, Mechanics of composite and multi-functional materials, Springer, pp 73–80, 2019). After that, the relevant toughening mechanisms for the most suitable reinforcements were analyzed in detail for front and rear parts in the military applications (such as military vehicles, boats, etc.). For this purpose, certain mechanical and physical properties (ISO 13586: 2000), (KIC—Fracture toughness stress intensity factor and GIc—Critical energy release rate in mode I) have been determined by fracture toughness tests (static 3P bending test with single edge notch specimens). Microstructural and fracture surfaces analyses have been carried out by means of scanning electron microscopy (SEM). © 2022, The Society for Experimental Mechanics.
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    Conference Object
    Citation Count: 0
    Impact Behaviour of Recycled Rubber-Based Composites Reinforced with Glass Bubbles and Alumina Fibers (γ-Al2O3)
    (Springer, 2023) Çakır Kabakcı,G.; Aslan,Ö.; Bayraktar,E.; Mechanical Engineering
    In this research, recycled rubber-based composites are considered with glass bubble (GB) and fine gamma alumina fiber (γ-Al2O3) reinforcements. The effect of the reinforcements with matrix, fracture characteristics of the composite are studied by impact-loading tests (i.e., drop-weight tests). These test results are simulated by finite element analysis (FEM) and the results are compared with the experimental results. Microstructural and fracture surface analysis are carried out by means of scanning electron microscopy (SEM). Mechanical test results show that the reinforcement with glass bubbles and aluminum oxide ceramic fibers generally increase the damping capacity and fracture toughness of the composites. © 2023, The Society for Experimental Mechanics, Inc.
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    Conference Object
    Citation Count: 0
    Static and Fatigue Behaviour of Recycled ThinSheet "Ti-Al-Nb" Based Composites Produced by Hot Forging Diffusion Process
    (Springer international Publishing Ag, 2024) Zambelis, Georges; Gatamorta, Fabio; Aslan, Ozgur; Miskioglu, Ibrahim; Bayraktar, Emin; Mechanical Engineering
    Within the framework of the common research project, the mechanical properties and fatigue behaviour of recycled thin sheet Ti-Al-based composites reinforced with atomized scrap aluminium (AA7075) and Nb elements have been evaluated. All the thin sheet sandwich structures were produced by the hot forging process, which is a semi-solid-forming process similar to partial melting hot forging. The effect of the chemical bonds during the production of these multifunctional sandwich composite structures was analysed using 3-point bending tests under static and dynamic (fatigue) loading conditions. Additional tensile tests have been carried out to evaluate the mating effect. Interface and microstructure of these composites have also been evaluated using scanning electron microscopy.
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    Doctoral Thesis
    Zırhlı muharebe araçlarında kullanılan döküm parçaların balistik ve mayın koruma performanslarının bilgisayar benzetimleri ile yüksek başarımlı hesaplanması
    (2023) Çetin, Barış; Aslan, Özgür; Mechanical Engineering
    Bu doktora çalışmasının temel amacı G18NiCRMo3-6 ve ADI JS 1050-6 isimli döküm malzemelerin yüksek hızlı darbe yüklerini de içeren elasto-plastik ve kırılma/kopma davranışlarını yüksek hassasiyetle tahmin edebilmektir. Bahsedilen malzemeler, zırhlı muharebe araçlarının üretiminde kullanılabilen dökümlerdir ve bu malzemeler araç üzerinde balistik ve mayın patlatması gibi ciddi tehditlerle karşılaşabilmektedirler. Bu amaçla, her iki malzeme için de ayrıntılı bir mekanik test programı oluşturulmuş, testler icra edilmiştir ve gerekli doğrulama işlemleri tamamlanmıştır. Proje kapsamındaki çalışmalarla oluşturulan malzeme modellerinin tahminleri deneysel bulgularla oldukça uyumludur. Bu çıktı, yalnızca farklı yüklemelere sahip ayrı geometrilerin sonlu elemanlar analizi (SEA) bazlı tahminlerinde değil, aynı zamanda döküm bileşenlerinin makro-mekanik performansı üzerindeki farklı kusur seviyelerinin yorumlanmasında da büyük avantajlar sağlama potansiyeline sahiptir.
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    Conference Object
    Citation Count: 0
    Development of Ni-Al-Based Composites Reinforced with Recycled AA7075+AA1050 and Ceramics Produced by the Sintering plus Forging Process
    (Springer international Publishing Ag, 2024) Gatamorta, Fabio; Klinkova, Olga; Aslan, Ozgur; Miskioglu, Ibrahim; Bayraktar, Emin; Mechanical Engineering
    In this study, the microstructural formation and static/cyclic compression behavior of "Ni-Al+AA7075 +AA1050"-based composites reinforced with ceramics (TiC-TiB2) have been evaluated. It is aimed at creating a new design to be an alternative to traditional alloys/composites used in the aeronautical industry. These composites are generally produced using a combined method that we call "sinter + forging processes". The static and dynamic properties and also the microstructure (including the distribution of reinforcement elements) are evaluated in detail.
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    Conference Object
    Citation Count: 0
    Recycled Natural Rubber-Based Composites Reinforced with Nano Boron Nitride in Thermal Conductive and Electrical-Insulating Fields
    (Springer, 2023) Çakır Kabakcı,G.; Sonar,M.; Aslan,Ö.; Bayraktar,E.; Mechanical Engineering
    In this research, recycled natural rubber (NR) based composites reinforced with the doped nano boron nitride (NBN) with the high resolution in thermal conductive and electrical-insulating field were designed, and their properties were studied. Good distribution of doped NBN in the matrix has shown substantial increments of thermal conductivity and high electrical insulation depending on the quantity in the matrix. Additionally, the thermal analysis indicates that NR/NBN composites have excellent heat-transfer capacity during heating and cooling processes, which suggests great potential application in thermal conductive and electrical insulating fields. The procedure can find multiscale particle-matching ways to achieve the maximum effective thermal conductivity under a given filler load. It should be emphasized that the optimized effective thermal conductivity obviously can be improved with the increase in the volume fraction of the reinforcement. © 2023, The Society for Experimental Mechanics, Inc.
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    Book Part
    Citation Count: 0
    A Numerical Approach to Simulating Oxidation in Thermal Barrier Coatings
    (Elsevier, 2020) Saeidi,F.; Gurses,E.; Aslan,O.; Department of Mechanical Engineering; Department of Basic English (Prep School); Mechanical Engineering
    Computational analysis and simulation of multi-physics phenomena taking place in coating systems is still a challenging task. Specifically, for ceramic coatings used as a system of protection for base materials against elevated temperatures, known as thermal barrier coating (TBC) systems, construction of continuum level models which can express coupled nonlinear phenomena has attracted great attention. Thermal stresses, oxidation, creep and numerous other mechanisms and phenomena makes it even harder to model and simulate the behavior of TBCs. In this article, a new numerical model which allows simulation of oxidation and thermally grown oxide (TGO) of bond-coat is presented. Phase field theory is used with finite strain formulation and implemented using user element subroutine (UEL) in ABAQUS software for finite element method. Results are compared with experimental data available for TGO in the literature. © 2020 Elsevier Inc. All rights reserved
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    Book Part
    Citation Count: 0
    Design of Recycled Aluminium (AA7075)-Based Composites Reinforced with Nano Filler NiAl Intermetallic and Nano Niobium Powder Produced with Vacuum Arc Melting for Aeronautical Applications
    (CRC Press, 2023) Kasar,C.; Aslan,O.; Gatamorta,F.; Miskioglu,I.; Bayraktar,E.; Department of Basic English (Prep School); Mechanical Engineering
    In the frame of the common research project, the mechanical properties of recycled gas atomized scrap aluminium (AA 7075)-based composites reinforced with nano filler NiAl intermetallic and niobium (Nb) elements have been evaluated. Firstly, the mixture was homogenized by means of a ball milling process for 4 hours. After cold compaction of the compositions, the final specimens have been produced with “vacuum arc melting” for aeronautical applications. Static and dynamic compression tests have been conducted. Additional tensile tests have also been carried out. Experimental results were compared with a finite element method. The interface and microstructure of these composites have also been evaluated by a scanning electron microscopy. © 2024 selection and editorial matter, N. M. Nurazzi, E. Bayraktar, M. N. F. Norrrahim, H. A. Aisyah, N. Abdullah, and M. R. M. Asyraf; individual chapters, the contributors.
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    Book Part
    Citation Count: 0
    Design of Recycled Aluminium (AA 7075+AA1050 Fine Chips)-Based Composites Reinforced with Nano-SiC Whiskers, Fine Carbon Fiber for Aeronautical Applications
    (CRC Press, 2023) Aslan,O.; Klinkova,O.; Katundi,D.; Miskioglu,I.; Bayraktar,E.; Department of Basic English (Prep School); Mechanical Engineering
    In the frame of the research project that is going on, the mechanical properties of recycled gas atomized scrap aluminium (AA7075) based hybrid composites reinforced with nano SiC filler (whisker)+ Graphene Nano plateless (GNP) and fine carbon Fibers elements have been evaluated. Firstly, the mixture was homogenized by means of ball milling process during 4 hours. After hot compaction at 200°C compaction of the compositions the final specimens have been produced with the novel combined method called “SINTER+FORGING” at 650°C followed by relaxation treatment at 200°C during the 2 hours. This type of hybrid composite is used for aeronautical applications. Static and dynamic-Time dependent compression tests have been conducted. Interface and microstructure of these composites have also been evaluated by Scanning Electron Microscope (SEM). © 2024 selection and editorial matter, N. M. Nurazzi, E. Bayraktar, M. N. F. Norrrahim, H. A. Aisyah, N. Abdullah, and M. R. M. Asyraf; individual chapters, the contributors.