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    Effects of reinforcement volume fraction on the abrasive wear behaviour of Al-MgO composites produced by the vacuum infiltration method
    (Sage Publications Ltd, 2011) Pul, M.; Kucukturk, G.; Calin, R.; Seker, U.
    In this study, the effects of the reinforcement volume fraction on the abrasive wear behaviour of reinforced MgO composites produced by the vacuum infiltration method with 5, 10, and 15 vol% of the volume fraction of Al matrix were investigated. The abrasive wear tests were carried out by 80, 100, and 180 mesh Al2O3 abrasive paper and the pin-on-disc wear device under 10, 20, and 30 N loads at 0.2 m/s sliding speed for 3 s. At the end of the wear tests, scanning electron microscope photographs of worn surfaces were taken and the microstructures were analysed by energy dispersive spectrometer (EDS). By checking the images of the worn surfaces, it was observed that the abrasive wear effect increased by increasing the reinforcement ratio. The maximum wear loss was reported under 30 N loads and by 80 mesh abrasive paper. It was found that according to the increment of reinforced MgO in the composite, the amount of wear also increased. On the other hand, the amount of porosity and the reinforcement volume fraction are crucial parameters in the abrasive wear effect.
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    Investigation of the effect of rake angle on main cutting force
    (Elsevier Sci Ltd, 2004) Günay, M.; Aslan, E.; Korkut, I.; Seker, U.
    This paper presents a study of comparison of empirical and experimental results for main cutting force during machining rotational parts by unworn cutting tools. A dynamometer was designed and produced for measuring the forces. Two strain gauges were placed at the correct position on the machine tool and cutting tool at the design stage. Correct gauge positioning sensed displacements of the tool caused by cutting forces. AISI 1040 was used as the workpiece material. Main cutting force (F-c) was measured for eight different rake angles changing from negative to positive values at five different cutting speeds. The depth of cut and feed rate were kept throughout the experiments. Empirical results according to Kienzle approach were compared with experimental results. Main cutting force was observed to have a decreasing trend as the rake angle increased from negative to positive values. The deviation between empirical approach and experiments was in the order of 10-15%. (C) 2004 Elsevier Ltd. All rights reserved.