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Öğe Dynamic behavior of screwed joints for CFRP composite laminate structures under impact loading(Elsevier Sci Ltd, 2022) Can, Ahmet; Meram, AhmetThe detachable joining techniques in composite laminates compared to metals are limited and assumed one of the major obstacles in developing composite structures. In prior work, the authors successfully investigated the screw joining technique for CFRP composite laminates under static loads. However, the dynamic behavior of this joining technique for composite laminates was unknown. This study was conducted to examine the dynamic behavior of the screwed joints in CFRP composite laminates. For this purpose, impact tests were performed on bolted composite laminates with metric screw sizes ranging from M6 to M14 and different pitch screws. The dynamic response of screwed joints was determined by load deflection, peak force, and failure mechanism. Macro and scanning electron microscope (SEM) images were used to analyze the damage mechanisms in detail depending on screw and pitch size. Pure stripping tests are also conducted to determine the effect of tooth root thickness on the stripping force. The damage mechanism changed from interlaminar delamination to push-out delamination as the pitch increased, and outward fibering was primarily observed in high pitches. The maximum dynamic failure loads for the screwed joints were between 27.55 and 78.12 kN.Öğe Effect of Edge Trimming Parameters on Surface Quality of Carbon Fiber Reinforced Polymer Composites(2017) Can, AhmetBu çalışmada karbon elyaf takviyeli polimer matrisli kompozitlerin kenar budama işlemlerinin işlenebilirliği ve yüzey kalitesi araştırılmıştır. Frezeleme tipi, takım tipi, kesme hızı ve ilerleme hızının, yüzeyin ilerleme ve ilerlemeye dik doğrultusunda oluşan yüzey pürüzlülüğüne ve deformasyon davranışına olan etkileri araştırılmıştır. Üç farklı kesici ağız sayısına (2,4,6) sahip mikro taneli karbür kesici takımlarla dik ve eğimli çevresel frezeleme işlemi gerçekleştirilmiştir. Kenar budama işlemleri için kullanılan frezeleme parametreleri Taguchi deney tasarımına göre uyarlanmıştır. Parametrelerin işlenebilirlik çıktıları üzerine etkilerinin katkı oranları varyans analizi (ANOVA) ile istatistiksel olarak belirlenmiştir. İşlenebilirlik çıktıları olan yüzey pürüzlülüğü ve deformasyon miktarlarına göre eğimli yanal frezeleme işleminin dik frezelemeye göre daha üstün olduğu sonucuna varılmıştır. Dik yan yüzey frezelemeyle yapılan kenar budama işlemlerinde Tip-II delaminasyon yani kenarlarda kesilmeden uzayan uzun elyaf demetlerinin bulunduğu gözlenmektedir. Eğimli frezeleme ise Tip I-II delaminasyonun aynı anda ortaya çıkarmakta yani kenarlarda kesilmemiş uzun elyaf demetleri ve kenardan içe doğru kırılmış tabakalar oluşturmaktadır. Kesici ağız sayısı ve kesme hızı arttıkça ve ilerleme hızı azaldıkça enine ve boyuna olan yüzey pürüzlülüğü ile deformasyon azalmaktadır. En iyi işleme koşulları kesme hızının en yüksek seviyede, ilerlemenin en düşük seviyede 6 ağızlı kesicide eğimli frezeleme koşullarında sağlanmıştır.Öğe Experimental investigation of screwed joints capabilities for the CFRP composite laminates(Elsevier Sci Ltd, 2019) Meram, Ahmet; Can, AhmetThe load-carrying capability of the screwed joints for the carbon fiber reinforced polymer (CFRP) composite laminates was investigated by compression and torsion tests. To this end, the M6, M8, M10, and M12 metric internal threads were obtained by tapping directly into the CFRP composite laminates. In order to avoid material damage, the milling and tapping operations were implemented using CNC controlled machine tools. Quasi-static compression and torsion tests were carried out on the simply tapped and Helicoil reinforced screwed joints in the universal tensile-press test machine under uniform test conditions. The applied force and torque values respect to the screw displacements were obtained. Based on the experimental outcomes, the load-carrying capability and failure mechanisms of screwed joints were evaluated. The SEM graphics were utilized to explain the failure mechanism of threads. The load-carrying capability of joints increased with increasing the joint size. Helicoil reinforced specimens showed significantly higher maximum failure load and torque values compared to simply tapped specimens. Although, Helicoil inserts were effective in improving load-carrying of screwed joint, analysis of Helicoil performance proved that the effectiveness of Helicoil decreased with an increase in metric screw size. The computed stripping strength values indicated that Helicoil reinforced screwed joint can be an alternative to riveted and adhesively bonded joints as a detachable joining technique for thick CFRP composite laminates.Öğe Study on the Machinability of SMC Composites During Hole Milling: Influence of Tool Geometry and Machining Parameters(Springer Heidelberg, 2019) Can, AhmetThe machining of composite materials is generally performed to obtain the required geometry and dimensional tolerances. This paper applies the Taguchi method to investigate the effects of end-milling parameters on the machinability outputs of chopped glass fiber-reinforced polymer composites. The main aim is to investigate the machinability and defects generated by four different end-mill tool geometries when applying hole expansion on A-Class Sheet Mold Compound (SMC) composites. The resultant force, surface roughness, and peel-up delamination behavior were evaluated under different cutting conditions in milling operations, while the milling experiments were conducted under different parameters and levels according to the Taguchi method. The contribution ratio of parameters on machinability outputs was analyzed statistically via analysis of variance and regression analysis. The most suitable cutting conditions to achieve a high-quality hole in the least amount of machining time on an SMC composite include higher cutting speed, lower feed rate, higher number of teeth-as with six-fluted helix and eight-fluted burr-style end mills-and down-milling with CCW circular interpolation.
