Yazar "Akkuş, Harun" seçeneğine göre listele

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    AISI 1040 ÇELİĞİNİN İŞLENEBİLİRLİĞİ SIRASINDA OLUŞAN YÜZEY PÜRÜZLÜLÜĞÜ DEĞERLERİNİN FARKLI TAHMİN MODELLERİ İLE ARAŞTIRILMASI
    (2021) Akkuş, Harun
    Bu araştırmada, 45 HRc sertlik değerine sahip AISI 1040 çeliği torna tezgahında işlenmiştir. Kesme hızı, ilerleme ve talaş derinliği parametreleri üçer seviye olarak belirlenmiştir. Deney listesi Taguchi L9 ortagonal dizilim ile oluşturulmuştur. Deneyler CNC kontrollü tornada gerçekleştirilmiştir. Tornalama işlemi sonunda ortalama yüzey pürüzlülüğü (Ra), off-line olarak elde edilmiştir. Elde edilen Ra değerleri Taguchi, çoklu regresyon modeli, yapay sinir ağı ve bulanık mantık ile modellenmiştir. Bu modeller arasındaki yüzdesel fark belirlenmiştir. Taguchi yaklaşık %86,27, çoklu regresyon modeli yaklaşık %85,85, yapay sinir ağı yaklaşık %78,92 ve bulanık mantık yaklaşık %93,86 doğrulukla test sonuçlarını tahmin etmiştir.
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    Enhancement of Shear Strength in Lap Joints with Different Surface Patterns
    (2023) Yaka, Harun; Semiz, Levent; Akkuş, Harun
    In this study, surface patterning with CNC vertical machining center was applied to aluminum surface for the enhancement of the shear strength of the epoxy bonded lap joints. It was found that the pattern shape affected shear strength and among vertical, square, horizontal, 45 degree and diamond patterns, 45 degree provided the highest shear strength of 24.6 MPa. Moreover, the pattern features also affected the shear strength. Decrease in the depth led to slightly lower shear strength, whereas increase in the depth gave slight enhancement. The optimum depth was found as 300 ?m and the obtained shear strength was calculated as 25.5 MPa. Additionally, increase in the width length led to lower shear strength. On the other hand, decrease in the width length provided higher shear strength. The increment became smaller as the width length increased. Also, after a point, the trend reversed and the shear strength decrease slightly. The optimum width length and the corresponding shear strength were found as 1.0 mm and 28.0 MPa, respectively.
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    Experimental and response surface methodology investigation of cast material obtained by melting and recycling of chips
    (2021) Akkuş, Harun; Yaka, Harun
    In this study, it is aimed to draw attention to the new materials and recycling produced by the melt-casting process of chips in industry. For this purpose, the aluminum 5000 series material with 90 HB hardness was turned. The chips obtained by turning were melted in our own melting furnace and molded as a cylinder. The hardness value of the material obtained by casting method was measured as 95 HB. Materials were examined by surface microscopy. Experimental design, analysis of surface roughness values of normal and cast material, regression equations, coefficients of determination, optimum point, cutting parameters interaction graphs were carried out with response surface methodology (RSM). It was concluded that the surface roughness values decreased in the casting material. In order to determine this reduction, the surfaces of the chips and materials were examined. In prediction experiments, it was observed that the RSM model yielded 90% reliability.