- Biographical Details Professor Yusuf SAHIN completed his B.Sc and M.Sc degree at Manufacturing Technology Department ... moreBiographical Details
Professor Yusuf SAHIN completed his B.Sc and M.Sc degree at Manufacturing Technology Department of Gazi University in Ankara, Turkey. He joined to Production Research Group in Gazi University, worked as a research assistant from 1985 to 1989. Funded by Higher Eduation Council (YOK) to United Kindom to do some researchers on “composites materials”. He awarded his Ph.D Degree in “area of metal matrix composites, their mechanical and wear properties” at Department of Mechanical Engineering from University of Aston in Birmingham (UK), 1994.
In 1995, he was appointed as an Assistant Professor at Mechanical Education Department in Gazi University in Ankara (Turkey), promoted to Associate Professor in 1996 at same department. From 1996 to 2002, worked as a Lecturer in Gazi University, and he promoted to Professor as a Lecturer in 2002 to 2011. He then was appointed as a Seniour Lecturer at Department of Manufacturing Engineering of Technology Faculty at Gazi University in 2011. Also, he was given a lecturer at Turkish Military Academy between 1999-2002 and at Department of Mechanical Engineering in Atilim University between 2010-2011, respectively.
Prof Sahin is currently funded by Turkish Scientific&Technical Council (TUBITAK) for investigation on “sliding wear of polymeric based advanced composite materials” at Soete Lab of Mechanical, Construction&Production Engineering Department in Ghent University. The current project is related to “Development of basalt fabric/carbon fabric-reinforced epoxy composites”. Friction and dry sliding wear behaviours are also evaluated under different conditions using a Taguchi, RSM method and SEM examination.
His research interests include Materials science; Composite materials and Processing, Mechanical properties, Tribology, Powder metallurgy, Manufacturing processes, Metal cutting process, Polymer/Polymer composites, and Experimental design and analysis.edit
The mechanical properties and wear behaviour of B(SiC) fibre-reinforced metal matrix composites (MMCs) and aluminium alloy (2014) produced by metal infiltration technique were determined. Tensile tests were peliormed at different... more
The mechanical properties and wear behaviour of B(SiC) fibre-reinforced metal matrix composites (MMCs) and aluminium alloy (2014) produced by metal infiltration technique were determined. Tensile tests were peliormed at different conditions on both the alloy matrix and its composite, and the tensile fracture surfaces were also examined by Scanning Electron Microscopy (SEM). Dry wear of the composite materials sliding on hardened steel was studied using a pin-on-disc type machine. The effect of fibre orientation on wear rate was studied to provide wear resistance engineering data on the MMCs. Tests were carried out with the wear surface sliding direction set normal, parallel and anti-parallel to the fibre axis. Experiments were perfonned for sliding speeds of 0.6, 1.0 and 1.6 m/s for a load range from 12 N to 60 N. A number of sensitive techniques were used to examine worn surface and debris, i.e: Scanning Electron Microscopy (SEM), Backscattered Electron Microscopy (BSEM) and X-ray ...
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Nanoparticles and microparticles reinforced Al matrix composites were fabricated by spark plasma sintering, and the microstructure and tribological properties were investigated systemically. The nano-Al2O3 particle and micro-Al2O3... more
Nanoparticles and microparticles reinforced Al matrix composites were fabricated by spark plasma sintering, and the microstructure and tribological properties were investigated systemically. The nano-Al2O3 particle and micro-Al2O3 particle uniformly dispersed in Al matrix composites. The introduction of nanoparticles is beneficial to the decrease of friction coefficient and wear rate, while microparticles are responsible to the high friction coefficient, resulting in the abrasive wear. With the introduction of both nanoparticles and microparticles, their synergic effect will lead to the variation of tribological behavior.
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The dry wear characteristics of polytetrafluoroethylene (PTFE) composites filled with bronze, glass, and carbon fibers were investigated in heavy loading conditions. The scanning electron microscopy was used to determine the mechanisms of... more
The dry wear characteristics of polytetrafluoroethylene (PTFE) composites filled with bronze, glass, and carbon fibers were investigated in heavy loading conditions. The scanning electron microscopy was used to determine the mechanisms of their dry wear. An energy dispersive X-ray spectroscopy analysis revealed great differences between the wear surfaces of the composites. The friction forces at a fixed load were found to be lower for the glass- and carbon-filled composites than for the PTFE and bronze-filled ones.
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... composites. Chipping on the cutting edge was effective at higher speed for higher weight fraction composites but formation of a built-up-edge was evident at lower cutting speeds for lower weight fraction composites. Keywords ...
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A plan of experiments based on the combined techniques using orthogonal arrays and analysis of variance was employed on tribological behaviour of metal matrix and its composite, in a pin-on-disc machine using SiC abrasive grits under... more
A plan of experiments based on the combined techniques using orthogonal arrays and analysis of variance was employed on tribological behaviour of metal matrix and its composite, in a pin-on-disc machine using SiC abrasive grits under different conditions. The obtained results indicate that type of the work piece due to the introduction of SiC particle into the matrix alloy exerted
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ABSTRACT The surface roughness model in the turning of AISI 1040 carbon steel was developed in terms of cutting speed, feed rate and depth of cut, using response surface methodology and design of experiment. The surface roughness... more
ABSTRACT The surface roughness model in the turning of AISI 1040 carbon steel was developed in terms of cutting speed, feed rate and depth of cut, using response surface methodology and design of experiment. The surface roughness equations of cutting tools when machining the carbon steels were achieved by using the experimental data. The established equations show that the feed rate was the main influencing factor on the surface roughness and it increased with increasing the feed rate for both tools. For TiN‐coated tools, the feed rate is followed by depth of cut. For cermet tools, however, the feed rate is followed by cutting speed. In addition, the cermet tools showed the better surface roughness than those of the coated cutting tools. The second order model shows that the square terms are statistically insignificant for both tools. For the cermet tools, however, the interaction terms are found to be statistically significant. The predicted wear behavior of the samples has been found to lie close to that of the experimentally observed ones. © 2004 American Institute of Physics
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The dry wear of polytetrafluoroethylene (PTFE)-based composites, including bronze-filled composites (B60), glass-filled composites (G15), and carbon-filled composites (C25), produced by the mold casting method were investigated under... more
The dry wear of polytetrafluoroethylene (PTFE)-based composites, including bronze-filled composites (B60), glass-filled composites (G15), and carbon-filled composites (C25), produced by the mold casting method were investigated under different sliding conditions. The Taguchi L27 method and the analysis of variance were used to identify the effect of process parameters on the wear of tested materials. Experimental results showed that the wear resistance of G15 polymer composites was better than those of C25 and B60 ones. The specific wear rate decreased with increasing sliding distance and load, but partly decreased with increasing tensile strength.
Research Interests: Materials Science, Powder Metallurgy, Metallurgy, Lean Manufacturing, Metal Cutting, and 9 moreComposite Materials, Use Wear Analysis, Polymers, Polymer Composites, Metal Matrix Composites, Manufacturing Engineering, Metallurgical and Materials Engineering, Friction and wear, and METAL CUTTING AND MACHINING
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Tribological behaviour of unidirectional carbon fibre-reinforced epoxy composites containing 42wt.% (CU42) and 52wt.% (CU52) carbon fibres fabricated by moulding technique was investigated on a pin-on-flat plate configuration. It is the... more
Tribological behaviour of unidirectional carbon fibre-reinforced epoxy composites containing 42wt.% (CU42) and 52wt.% (CU52) carbon fibres fabricated by moulding technique was investigated on a pin-on-flat plate configuration. It is the first time to measure static and dynamic coefficient of frictions and wear rates of epoxy composites under heavy loading conditions. Microstructures of composites were examined by scanning electron microscopy (SEM). The experimental results indicated the carbon fiber improved the tribological properties of thermoset epoxy by reducing wear rate, but increased the coefficient of friction. At higher load, average wear rates were about 10.8x10-5 mm 3 /N.m for composites while it was about 38.20x10-5 mm 3 /N.m for epoxy resin. The wear rate decreased with decreasing load while friction coefficient increased with decreasing load. Moreover, friction coefficient of composites of CU42 tested at 90 N load was measured to be in the range 0.35 and 0.13 for static and dynamic component, respectively.
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Surface finish and dimensional accuracy play a vital role in manufacturing engineering applications. Grinding is one of the most important method for producing a better surface quality. This paper describes a study of the influences of... more
Surface finish and dimensional accuracy play a vital role in manufacturing engineering applications. Grinding is one of the most important method for producing a better surface quality. This paper describes a study of the influences of cutting parameters such as table speed, depth of cut and feed rate on surface finish of AISI 2080 steels, based on the Taguchi (L27) method. The experimental results showed that the table speed was the machining parameter, which had a greater effect on the surface finish, followed by depth of cut, whereas feed rate showed no significant effect. Analysis of variance indicated that a better surface finish was obtained at 190 m/min speed, 0.003 mm depth of cut and 0.08 mm/rev feed rate.