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    EFFECT OF TOOTH WIDTH MODIFICATION ON WEAR IN BRASS SPUR GEARS
    (SCIBULCOM LTD, 2013) Imrek, H.; Sure, B.
    In this study, load distribution in meshing areas of single and double teeth of spur gears has been investigated. With a teeth modification, the load distribution was brought to a uniform state along the gear profile. In this gear, variable pressure distribution caused by the single and double teeth meshing and the radius of curvature along the active gear profile was approximate kept constant by maintaining a constant ratio of applied load to the tooth width (F/b) on every point. The modification made was solely based on the Hertz surface pressure distribution approach, which enables maintaining uniform distribution along the profile. The gears material was made of forging brass (CuZn38Pb2). In order to investigate clearly the effects of the wear on the gear profile shift were used. Experiments on wear both of modified gear and unmodified gear were made and the results were evaluated. It was found that wear depth along meshing area was almost uniform for the modified gears.
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    EFFECTS OF SLIDING SPEED IN A CuZn10 BRASS MATERIAL ON WEAR
    (SCIBULCOM LTD, 2009) Bagci, M.; Imrek, H.
    In, this experimental study, effects of sliding speed, load, coefficient of friction and, surface roughness on sliding wear were investigated. Many properties observed in metal sliding wear processes can be explained based on studying brass. For this reason, CuZn10 brass material was selected as the experimental specimen and tests were conducted under dry sliding wear conditions. The tests were conducted on a PLINT-TE53SLIM Multi-Purpose Friction and Wear Tester as block-on-ring, one of asymmetric configuration applications (ASTM G77). The contact between test specimen and counterface is a line. And a non-suitable contact geometry was used on opposite surface. The counterface was rotated at 10 different sliding speeds (0.25, 0.5, 0.75, 1, 1.25, 1.5, 4.75, 2, 2.25 and 2.5 m/s) and three different loads (5, 10 and 15 N) were applied on the test specimen, and every test specimen was subjected to 700 in tests. Graphs showing variations of weight loss against the applied loads and sliding speeds on the test specimen were plotted. Apart from this, graphs showing relation between coefficient of friction and sliding distance and that between surface roughness and sliding distance were plotted. Due to static coefficient of friction and high surface debrises at lower sliding speeds (0.25-0.75 m/s), wear values were high, whereas in higher sliding speeds (1.0-2.5 m/s), the wear values were low as a result of formation of oxide layers on contact surfaces. As sliding distances increased during low sliding speeds, firstly the coefficient of friction increased, then as the static friction was overwhelmed the coefficient of friction decreased. At higher sliding speed, depending on the increased heat, the coefficient of friction seemed to increase generally, this being caused by the oxide layer formed. With the increase in sliding distances some increase in surface debris values was observed. In addition, the increase in the load caused the increasing weight loss and hence higher Wears values.
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    Experimental investigation of wear behaviors of bronze and carbon-reinforced polytetrafluoroethylene alloy pivot pin bearings
    (SAGE PUBLICATIONS LTD, 2014) Imrek, H.; Demet, S. M.
    Due to their superior features, such as low coefficients of friction, resistance against chemical effects, and good strength-to-weight ratio, polymer-based composite bearings are widely used in industries. Polymer composite bearing calculations are made based on experimental study data. In this study, experimental investigations were conducted on polytetrafluoroethylene composite radial bearings reinforced with 35% carbon and 40% bronze material where bearing loads, sliding distances, and wear were taken into consideration. The results for both materials are given graphically and compared with each other. In accordance with the results, it was considered that polytetrafluoroethylene/bronze composite film thickness and film composition on the surfaces extensively affect wear rate. It was found that these films' thicknesses depends on adhesion between steel and composite surfaces, cohesive properties of composite, load, and sliding distance.