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UĞUZ, AGAH

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UĞUZ

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AGAH

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2019 - 201912020 - 20222
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    Determination of mechanical behavior of metal-rubber compound pulley part, finite element analysis and verification with tests
    (Gazi Üniversitesi, 2020-01-01) Uğuz, Agah; Penekli, Ufuk; UĞUZ, AGAH; Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Makine Mühendisliği Bölümü; 0000-0002-9244-3671; EBY-1783-2022
    Rubber is one of the most important materials of modern industry and have a wide range of usage owing to a number of superior properties. In this study, the mechanical behaviour of the metal-rubber combination pulley part transferring motion in the engine through the timing belt was examined by the finite element method, confirmed experimentally, and optimized. Uniaxial tension and pure shear tests were carried out physically to develop a hyperelastic material model. 3 parameter Mooney-Rivlin hyperelastic material constants were calculated by using force-elongation values obtained from uniaxial tension and, pure shear tests. Afterwards, pulley geometry was modelled, and displacements, stresses, reaction moments were examined under various torsional loadings. To confirm the accuracy of the pulley analysis, a servomotor driven pulley torsion testing machine was designed and manufactured. Then, torque and angle values were measured by testing the pulley parts at the same torsional angles. By this study, it was proven that mechanical behaviour of pulley can be expressed numerically. After validation of the material model and the results obtained using analysis method, the pulley geometry was further improved the stress levels on the rubber material were reduced 28% under the same loading conditions by using optimization tools.
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    Innovative low-cost, cold-walled CVD process development and CNT production by ethanol decomposition on iron-nanoparticles
    (Taylor & Francis Ltd, 2022-08-31) Cilsal, O. Ozan; Çakır, M. Cemal; Uğuz, Agah; Cilsal, O. Ozan; ÇAKIR, MUSTAFA CEMAL; UĞUZ, AGAH; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü.; 0000-0002-5736-8557; CKX-4912-2022; HOR-0562-2023; EBY-1783-2022
    A novel cold-walled CVD reactor has been designed for low-cost CNT synthesis. Aim was to eliminate the need for electric furnace, carbon-containing gas tanks and flowmeters, reducing energy consumption and gas emissions. Iron nanoparticles emulsion dip coating was preferred to simplify the catalyst preparation process. As carbon precursor, ethanol is used. Cost analysis was made to determine the initial investment needed. Design is also patented against unauthorized commercial usage. Samples obtained were characterized using SEM and Raman spectroscopy. Multi-walled CNTs and CNFs with diameters from 50nm to700 nm in straight and helical form have been synthesized. It has been observed that increase of the process duration and remaining soot on the reactor components has a diameter reducing and yield increasing effect on CNTs. Raman spectroscopy results show D, G and 2D Bands on the samples.
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    Publication
    A comparative study of electrospinning process for two different collectors: The effect of the collecting method on the nanofiber diameters
    (Japan Soc Mechanical Engineers, 2019-01-01) Çavdar, Fatma Yıdız; Uğuz, Agah; UĞUZ, AGAH; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü.
    In this study, an experimental investigation of the electrospinning process has been conducted using two successive Taguchi experimental designs, namely L-18 (3(5)) and L-9 (3(4)) for the electrospinning setups with a rotating drum and a stationary plate, respectively. The processing parameters are; concentration of poly(vinyl alcohol) in aqueous solution, applied voltage, distance between the needle and the collector, flow rate of the polymer solution and the rotational speed of the collecting drum. The primary process setup is used to analyse the effects of the parameters to the diameter of nanofibers and its standard deviation (SD), through examinations of the range analysis and graphical interpretations. The secondary process set up is used to gather the data to verify the results and to compare the effects of the collecting methods on the process outputs. A short literature review of the publications on which parameter effects were analysed by statistical methods is also presented.