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Öğe The Free Vibration Behaviors Of Hybrid Stacked Composite Plates With A Hole(Selçuk Üniversitesi, 2014) Sahin, Omer Sinan; Gunes, AydinIn this study, the free vibration characteristics of hybrid stacked fiber reinforced composite laminates with a hole was studied by using finite elements method. The hybrid composite laminates are composed of four layers with symmetrical and antisymmetrical sequences. The fiber reinforcement angles of plates are (15/-15)2, (30/-30)2, (45/-45)2 and (60/-60)2. The natural frequencies of hybrid composites were obtained for four different boundary conditions and different hole diameters and the results were presented in graphical form.Öğe Mechanical properties and microstructure of composites produced by recycling metal chips(SPRINGER, 2018) Aslan, Abdullah; Gunes, Aydin; Salur, Emin; Sahin, Omer Sinan; Karadag, Hakan Burak; Akdemir, AhmetIn this study, the processing and mechanical properties of porous metal matrix composites (MMCs) composed of spheroidal cast iron chips (GGG40) and bronze chips (CuSn10) and formed by hot isostatic pressing were investigated. Bronze chips (CuSn10) were used as a matrix component, and spheroidal cast iron (GGG40) chips were used as a reinforcement component. The MMCs were produced with different CuSn10 contents (90wt%, 80wt%, 70wt%, and 60wt%). The hot isostatic pressing process was performed under three different pressures and temperatures. The produced MMCs were characterized using density tests, Brinell hardness tests, and compression tests. In addition, the consolidation mechanism was investigated by X-ray diffraction (XRD) analysis and scanning electron microscopy. The test results were compared with those for bulk CuSn10 and bulk GGG40. Mechanical tests results revealed that the metallic chips can be recycled by using hot pressing and that the mechanical properties of the produced MMCs were similar to those of bulk CuSn10. XRD and microscopy studies showed that no intermetallic compounds formed between the metallic chips. The results showed that the CuSn10 and GGG40 chips were consolidated by mechanical interlocking.Öğe Production and mechanical characterization of prismatic shape machine element by recycling of bronze and cast-iron chips(GAZI UNIV, FAC ENGINEERING ARCHITECTURE, 2018) Aslan, Abdullah; Salur, Emin; Gunes, Aydin; Sahin, Omer Sinan; Karadag, Hakan Burak; Akdemir, AhmetIn this study, the production and mechanical properties of porous metal matrix composites (MMC's) by recycling of spheroid cast iron chips (GGG-40) and bronze chips (CuSn10) by hot isostatic pressing was investigated. The metal matrix composites were produced with four different CuSn10 contents, three different pressures and temperatures and effects of production parameters on porosity, hardness, flexure properties were examined. Samples were produced in prismatic shape with specified porosity. The mechanical properties were determined by Brinell and Micro Vickers hardness tests and three-point bending test. The consolidation mechanism of metallic chips was also investigated with optic microscopy. It was examined whether any second phase occurred between metallic chips by the help of XRD test. As a result of porosity test, it is found that metal matrix composites can have porosity value of as much as 20%. It is also showed that owing to excessive plastic deformation of Cu Sn10, the hardness of MMC material can be higher than bulk CuSn10. Three-point bending test showed that the flexure properties of MMC materials are is lower than that of bulk CuSn10. As a consequence, it showed that metallic chips were recycled with hot pressing successfully.