Person: ÇAKIR, MUSTAFA CEMAL
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ÇAKIR
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MUSTAFA CEMAL
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Publication Experimental and numerical investigation of in-plane and out-of-plane impact behaviour of auxetic honeycomb boxes produced by material extrusion(Gazi Üniversitesi, 2021-02-21) Çakan, Betül Gülçimen; Ensarioğlu, Cihat; Küçükakarsu, Volkan M.; Tekin, İbrahim E.; Çakır, M. Cemal; GÜLÇİMEN ÇAKAN, BETÜL; ENSARİOĞLU, CİHAT; Küçükakarsu, Volkan M.; Tekin, İbrahim E.; ÇAKIR, MUSTAFA CEMAL; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü.; 0000-0003-4118-8639; 0000-0003-1739-1143; F-9772-2018; AFD-6959-2022; DAO-6186-2022; HQW-4065-2023; JIT-5147-2023Auxetic structures, which have a negative Poisson's ratio, have good mechanical energy/impact absorption properties. These structures have found application in sandwich composites in the aerospace and defence industries, in the production of armour or protective sports equipment. In this study, the mechanical behaviour of the auxetic honeycomb structure in different directions (in-plane and out-of-plane) under impact loading was investigated. For the in-plane (x and y) and out-of-plane (z) directions, boxes with an auxetic honeycomb structure were produced by material extrusion method using Power ABS filament. In the experimental study, dynamic tests were carried out with a drop test machine. Besides, explicit analyses were performed by creating finite element models for these 3 directions. The experimental and numerical results have shown that the energy absorption property of auxetic honeycomb geometry is superior in the case of out-of-plane loading, in agreement with each other. In in-plane loadings, crush force efficiency (CFE) and crush forces were lower.Publication Process optimisation of hmdso polymerisation in pvd vacuum medium by numerical analysis for automotive industry(Gazi Üniversitesi, 2021-01-01) Geçim, Serkan; Kıdık, Gökmen; ; Sözer, İbrahim Emrah; Çakır, Mustafa Cemal; ÇAKIR, MUSTAFA CEMAL; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi.; 0000-0002-8774-7048A protective film layer is formed over aluminum coating with Physical Vapor Deposition (PVD) processes to ensure the resistance to environmental factors of the sub-components that include headlight reflective surfaces. Increasing endurance of the sub-components to environmantol factors is demanded with the development of automotive quality demands. In this study, Hexamethyldisiloxane (HMDSO) monomer releasing system that is used to form a protective film layer in PVD processes, has been optimized for releasing homogenously through the pipeline to the vacuum chamber by using finite volumes method. In addition, for uniform distribution of the HMDSO monomer release before polymerization into the vacuum medium, the substrate's jig revolution mechanics were analyzed by Computational Fluid Dynamics (CFD) simulations and the results were verified by experimental applications. The Sodium Hydroxide (NaOH) resistance of parts in various regions of the vacuum chamber was between 350-550 seconds before the study. However, it has been carried to over 1000 seconds for all regions after the optimisation process. Thus, ultimate life of the part and parts' resistance to environmental factors are increased. Thanks to this study, the desired quality requirement for the sub-components that are coated in the vacuum chamber with a volume of 2,84 m(3) was provided for all parts in different regions within the chamber. There is no need for new single planet machines with 1,13 m(3) volume vacuum chamber and production output that was obtained with the bigger chamber machine is doubled. No similar works have been found that are carried out by suppliers or in the literature.Publication Investigating the benefits of using circular die springs instead of rectangular die springs(Wiley, 2015-07-01) Gönen, D.; Oral, A.; Çakır, Mustafa Cemal; ÇAKIR, MUSTAFA CEMAL; Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü; HOR-0562-2023Die springs with rectangular cross section (rectangular die springs) are common in the industry. However, the production of rectangular die springs is difficult, and the cost of production is high. In this study, we examined the use of die springs with circular cross section (circular die springs), which are both easier to produce and less costly, in place of rectangular ones. To this aim, the fatigue life values of both die spring with equivalent specifications were compared experimentally. The results obtained were transferred to the finite element methods software to run the simulation of the fatigue test. From the experimental results obtained, it has been observed that using circular die springs in place of rectangular die springs is always possible, provided that the springs are guided with cast polyamide guides.Publication Influence of cutting parameters on the chip-tool interface temperature during the turning of Waspaloy(Carl Hanser Verlag, 2015-09-01) Işık, Yahya; Kuş, Abdil; Çakır, Mustafa Cemal; IŞIK, YAHYA; KUŞ, ABDİL; ÇAKIR, MUSTAFA CEMAL; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu; Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü; AAG-9412-2021; FBP-1850-2022; HOR-0562-2023Waspaloy, as a nickel superalloy, is a difficult-to-machine material used for gas turbine engine components that require considerable strength and corrosion resistance at high operating temperatures. The machining of nickel-based alloys generates high temperatures at the cutting tool edge. This research investigated the relationship between cutting parameters and cutting temperature, using a remote temperature measurement method employing an infrared thermometer. In addition, the effects of cutting parameters on surface roughness were examined. Experiments were conducted on Waspaloy AMS5708 superalloy samples and a PVD TiAlN-TiN-coated WNVG 080404-IC907 carbide insert was used during the turning process. It was observed that the highest cutting speed and highest feed rate generated higher temperatures and higher surface roughness. Better surface roughness was obtained with the lowest feed rate, the highest cutting speed and the higher cutting depth. No cutting fluid was used in the experiments.