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RISS 인기검색어
- 검색키워드
- 저자 : Y. SAHIN (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
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Thermo-Electrical Properties in Pb-Sb Hypereutectic Alloy
M. ¸Sahin,E. Çadırlı,Y. Sürme,D. Özkır 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.3
Pb-17 wt% Sb hypereutectic alloy was directionally solidified upward with three different growth rates (8μm/s, 18 μm/s, 42 μm/s, 166 μm/s and 497 μm/s) at a constant temperature gradient (3.6 K/mm) in the Bridgman-type growth apparatus. The dependence of characteristic microstructure parameters such as primary dendrite arm spacing (λ1) and secondary dendrite arm spacing (λ2) on the growth rate (V) were determined by using a linear regression analysis. Variations of electrical resistivity (ρ) for cast samples for temperatures in the range of 300-550 K were measured by using a standard dc four-point probe technique. The variations of thermal conductivity with temperature for the same alloys were determined from the WiedemannFranz and SmithPalmer equations by using the measured values of electrical resistivity. The enthalpy of fusion for the same alloys were determined by means of a differential scanning calorimeter from a heating trace during the transformation from solid to liquid. The corrosion resistance was analyzed by Tafel extrapolation and linear polarization resistance methods conducted in a 5% sodium chloride solution in contact with air maintained at room temperature. Effects of the growth rate on the electrical resistivity and corrosion resistance were also investigated.
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The effect of particle size on tool wear of SiCp-reinforced metal matrix composite
Y. Sahin,G. Sur 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
The effect of particle sizes of the metal matrix composites containing 10 wt.%SiCp was investigated with using various tools. The results showed that tool life decreased considerably with increasing particle size and cutting speed. The wear resistance of TiC-coated tools was considerably higher than that of the other tools. It was observed that abrasive wear was the main responsible mechanism for wear of the tool while thermal cracks were at high speed while a built-edge formation was also evident at lower speed.
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Wear Property of Al₂O₃-Particle-Reinforced Aluminium Composite
Y. Sahin,A.Riza Motorcu 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
The abrasive wear behaviour of Al₂O₃ particle-reinforced aluminium composite was investigated. The wear rate of the composite and the matrix alloy has been expressed in terms of the applied load, sliding distance and particle size using linear factorial design approach.
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PRODUCTION AND MACHINABILITY OF SiCp-REINFORCED AL-2014 ALLOY MATRIX COMPOSITES
I. CIFTCI,Y. SAHIN 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
SiCp-reinforced metal matrix composites (MMCs) containing 8 wt% and 16 wt% of SiCp-reinforced with 30 and 45 ㎛ in sizes were prepared by a melt stirring-squeeze casting technique. Microstructural observation showed that particle distributions were reasonably well. Turning experiments were carried out on the composites using uncoated and triple-layer coated carbide tools at various cutting speeds under a constant feed rate and depth of cut. Coated tools indicated better performance than uncoated tools for all the materials while the poor surface finish was obtained for coated tools.
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Zeynep Ilbay,Selin Sahin,Kemal Büyükkabasakal 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.9
Response surface methodology (RSM) and artificial neural network (ANN) were used to evaluate the ultra-sound-assisted extraction (UAE) of polyphenols from olive leaves. To investigate the effects of independent parameterson total phenolic content (TPC) in olive leaves, pH (3-11), extraction time (20-60 min), temperature (30-60 oC) andsolid/solvent ratio (500 mg/10-20 mL) were selected. RSM and ANN approaches were applied to determine the bestpossible combinations of these parameters. Box-Behnken design model was chosen for designing the experimentalconditions through RSM. The second-order polynomial models gave a satisfactory description of the experimental data. Experimental parameters and responses were used to train the multilayer feed-forward networks with MATLAB. ANNproved to have higher prediction accuracy than that of RSM.
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Source parameters for small–moderate earthquakes in Marmara Region (Turkey)
Tahir Serkan Irmak,Evrim Yavuz,Hamdullah Livaoğlu,Erman Şentürk,Emre Y. Sahin 한국지질과학협의회 2020 Geosciences Journal Vol.24 No.5
The main aim of this study is to investigate the self-relation and self-similarity of earthquakes in and around the Marmara Sea (NW Turkey) by using these obtained source parameters. With this purpose, spectral source parameters for 77 small to moderate earthquake (3.5 ≤ ML ≤ 5.2) that occurred during 2004–2018 have been determined from P and S wave spectra according to Brune’s source model by using regional broadband seismograms. The average ratio of P/S wave corner frequency is found to be 1.3 that suggesting higher corner frequency for P wave. The static stress drops range from 0.1 and 136 MPa with a median value of 9.8 MPa (98 bars). The high stress drops for these events can indicate high frictional strength and low strain-rate of the faults. Similarly, the low values of the stress drop can indicate a general weakness of the faults in the study area. There is no clear dependence between the seismic moment and the static stress drop in the analyzed events but some events which have lower seismic moment value also have lower stress drop. Obtaining results indicated the corner frequency decreases with increasing of the seismic moment. Also, a slight depth dependence of the corner frequency has been observed for the analyzed events. Shallower events have larger corner frequency value than deeper events. Also, a clear depth dependence of the stress drop values has not been observed. However, the depth dependence of the seismic moment is seen more clearly. Our results indicated that the deeper events have larger seismic moment values in the study area. In spite of scattering in small events, a linear relationship between local magnitude (ML) and moment magnitude (MW) could be obtained as MW = 1.4261(± 0.31) + 0.6399(± 0.08)ML from P waves spectra and MW = 0.0136(± 0.21) + 0.9883(± 0.05)ML from S wave spectra and calculated MW values are consistent with waveform inversion (centroid moment tensor – CMT) results. These relationships may be useful for seismic hazard studies in the study area.
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