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BİLİCİ, MUSTAFA KEMAL

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BİLİCİ

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MUSTAFA KEMAL

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    Investigation of friction stir spot welding of high density polyethylene and polypropylene sheets
    (SAGE PUBLICATIONS LTD, 2021) BİLİCİ, MUSTAFA KEMAL; Bilici, Mustafa Kemal
    In this study, two different polymer materials were used. In the joints made with friction stir spot welding, firstly (PP/PP and HDPE/HDPE) and then different materials (PP/HDPE, HDPE/PP) joining processes were carried. The influence of the tool rotational speed and the stirring time on joint formation and weld strength were determined. The temperature of the liquid welding materials varies according to the materials to be combined. High weld strengths were obtained at the friction stir spot welding of similar plastic sheets. The highest weld strengths were obtained in PP-PP welds. Low weld strengths were obtained at the friction stir spot welding of dissimilar plastic sheets because of immiscible and incompatible blends formed during the welding operation. The lowest weld strengths were obtained in PP-HDPE welds. The chemical composition and the phase morphology of the blends, the mechanical scission occurrence and the welding residual stresses determine the strength of the welds.
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    Investigation of Factors Affecting Friction Stir Welding of Polyethylene by ANOVA Analysis
    (KAUNAS UNIV TECH, 2021-08-23) BİLİCİ, MUSTAFA KEMAL; Bilici, Mustafa Kemal; Yukler, Ahmet Irfan; Kurtulmus, Memduh; Kartal, Ilyas
    The variables that are effective in joining high density polyethylene sheets by friction stir welding (FSW) have been investigated. In order to understand the effects of welding parameters, using Taguchi optimization, tool rotation speed, feed rate, shoulder diameter and pin diameter values were selected in a wide range. The results obtained with Taguchi optimization method were evaluated according to the highest / the best signal-noise ratio. Macro photographs taken crosssectional view taken the weld seam, SEM images and hardness measurements were used to evaluate. As a result of the evaluation, the accuracy of the optimization was found to be approximately 96 %. As a result, feed rate and shoulder diameter were determined as the most effective parameter affecting the welding quality and welding performance. These two parameters (shoulder diameter and feed rate) have found to effect of approximately 65 % on tensile strength, weld quality and hardness. Finally, it has obtained that the most effective welding parameter was the shoulder diameter with 40.81 %.
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    Additive manufacturing in formula one (F1) cars: A review on processes, applications
    (2023-12-01) BİLİCİ, MUSTAFA KEMAL; BİLİCİ M. K.
    t Additive manufacturing (AM) technology has been developing rapidly in recent years and its use in different sectors is increasing day by day. The working system of AM technology, unlike traditional production methods, is a layer-based production process by creating layers on top of each other. Due to its advantages such as material savings, low cost, production of parts without the need for molds and design flexibility, especially in complex shaped parts, it has found use in many fields, especially in medical, aviation and automotive. The biggest disadvantage of the AM method is that parts of a certain size can be produced due to the size of the part to be produced. To eliminate this problem in AM technology, it is possible to create large parts by combining small parts. In this research study, the role and development of additive manufacturing in the production and development of Formula One (F1) cars, which is the leading world championship in motor sports, which parts are produced with this method and why, in a system based on continuous improvement, A.M. on what advantages it provides. Examples are given on the parts produced by additive manufacturing in Formula 1 vehicles, and the advantages of being produced with additive manufacturing are explained with sample photographs.