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Öğe An ANFIS model for predicting workpiece deformation during the milling of thin-walled composite components(Sage Publications Ltd, 2026) Ozdemir, Burak; Emir, Ender; Bahce, Erkan; Yardimeden, Ahmet; Kilickap, ErolThe milling of thin-walled structural components is a meticulous procedure, particularly for workpieces with diminished mechanical qualities. Such workpieces are subject to greater deformation due to the cutting force. These deformations have a negative effect on the machining accuracy of the machined parts. Therefore, it is important to focus on the causes and effects of workpiece deformation in order to understand the surface machining quality of the workpiece. The aim of this study is to calculate the deflection of the workpiece during milling of thin-walled components made of glass fiber reinforced polymer composite (GFRP), carbon fiber reinforced polymer composite (CFRP) and basalt fiber reinforced polymer composite (BFRP). The tests were carried out at three different feed rates (0.1-0.2-0.3 mm/rev) and three different speeds (2000-3000-4000 r/min). A high-speed camera was used to detect the deflection of the thin-walled workpiece during milling. The effect of machining parameters on the variation of cutting force and deflection was statistically evaluated by analysis of variance. In order to better understand the behaviour of the parameters in the process, a predictive model was created using the artificial intelligence method Adaptive Network Based Fuzzy Inference System (ANFIS). The model is able to predict the cutting force with an accuracy of 65.7% and the deformation with an accuracy of 98.9%.Öğe Analysis of Drilling Behaviour in Jute Fibres Reinforced Natural Composites(Taylor & Francis Inc, 2023) Ozdemir, Burak; Yardimeden, Ahmet; Bahce, Erkan; Kilickap, Erol; Emir, EnderIn the study, Natural jute composite materials, which have environmental advantages due to their easily degradable nature were drilled with different processing parameters and the effects of thrust force, vibration and temperature changes on hole quality were investigated. The effect of feed and spindle speed was statistically analyzed using ANOVA method. The thrust force, vibration and temperature factors that occur depending on the drilling parameters vary and affect the roughness and delamination values. The effect of feed and speed on thrust force was calculated as 97.87% and the feed effect (90.85%) is far greater than the speed (9.15%). The effect of drilling parameters on vibration is statistically insignificant due to the different spread behavior in the layers of the composite material (R2 = 0.2329). However, feed effect on vibration (94.6%) is greater than the speed effect (6.06%). The temperature is affected by 96.93% of the drilling parameters and the speed is 84.16% and the feed is 15.83%. The roughness effect depending on the drilling parameters is measured as 84.91%. The effect of speed on roughness (90.26%) is greater than the feed (9.73%). It has been determined that this situation is mostly related to vibration and temperature.Öğe Estimation of Forces in Longitudinal and Multi-Pass Milling of GFRP and ABACA Composites Utilizing Machine Learning Techniques(SAGE Publications Ltd, 2026) Özdemir, Burak; Emir, Ender; Bahçe, Erkan; Yardımeden, Ahmet; Kılıçkap, ErolIn this study, workpieces made of glass fibre reinforced polymer and ABACA composite materials were machined by longitudinal and multi-pass milling methods with three different feed and speed parameters. The effect of milling methods on the finish surface was discussed through microscope images. The effect of machining parameters on the force was analysed by measuring the force values changing during machining. For this purpose, advanced prediction modelling was performed with the Random forest machine learning method. The effect of machining methods and parameters on cutting force is predicted with an average success rate of 86%. The primary contribution of this research lies in providing a comparative assessment of natural and polymer composites under distinct milling conditions and introducing a data-driven approach for accurate cutting-force prediction. The findings provide new insights into the processing of natural fibre composites as an alternative to polymer composites in milling. © The Author(s) 2025Öğe Examining the impact of fiber orientation angle and drilling parameters on the quality of holes in GFRP pipes(Sage Publications Ltd, 2025) Ozdemir, Burak; Emir, Ender; Bahce, Erkan; Yardimeden, Ahmet; Kilickap, ErolThis study examined the impact of altering the fiber orientation angle on delamination and surface quality in glass fiber reinforced polymer (GFRP) pipes. GFRP pipes are manufactured at three distinct orientation angles: 30 degrees, 60 degrees, and 90 degrees. Experiments were conducted at four distinct feed rates (0.05, 0.1, 0.2, 0.3 mm/rev) at three varying speeds (2000, 4000, 6000 rpm). The impact of the fiber orientation angle on thrust force, entry and exit delamination, and surface roughness of the holes was examined. The orientation angle significantly affected other parameters (p < 0.05). An orientation angle of 90 degrees generated increased thrust force while reducing roughness and delamination in comparison to other orientation angles. At a 90 degrees orientation angle relative to 30 degrees and 60 degrees, an approximate increase in thrust force of 4.8%-4.1%, a decrease in surface roughness of 25%-21%, and a decrease in delamination of 23%-7% was observed.Öğe Experimental investigation and FEM analysis of chip morphology in the turning of ASTM F-75 CoCrMo alloy(Yildiz Technical Univ, 2024) Emir, Ender; Ozdemir, Burak; Bahce, ErkanDuring the machining process, problems such as tool wear, high temperature, force distribution, and surface quality deterioration must be fully understood. Control of these problems with experimental studies and numerical analyses is important in ensuring dimensional accuracy and surface integrity of the cutting tool, workpiece, and also the finished product. The aim of this study is to investigate the effects of machining parameters on chip morphology, residual stresses and tool wear in turning operations of ASTM-F75 CoCrMo alloy experimentally and by finite element method (FEM) simulation. The study was carried out at three different feed rates (0.1, 0.2, 0.3 mm/rev) and at a constant cutting speed of 80 m/min both experimentally on a CNC turning machine and with FEM simulation. From the obtained results, the formation of cracks and adhesions on the surfaces of the chip were observed due to the increase of the feed rate. According to the orthogonal cutting model, chip height ratio (Gs) and tooth pitch (Pc) values of saw-tooth chips supported each other with measurements taken from both FEM images and experimental images. With the increase of the forward speed, the Gs ratio decreased, while the Pc increased. In addition, microscopic images obtained from the cutting tool also showed that the rate of crater wear gradually increased with increasing feed rate. As a result, it is seen that machining parameters have a significant effect on cutting tool and chip morphology in CoCrMo ASTM-F75 alloy turning.Öğe Mechanical characterization of lattice structure produced by additive manufacturing under torsion and compression(SAGE Publications Ltd, 2024) Akbay, Özgün Ceren; Özdemir, Burak; Bahçe, Erkan; Emir, Ender; Uslu Uysal, MineIn the present paper, the torsion and compression behaviors of lattice structures were studied. The PLA (Polylactic Acid) materials were used in assembly and produced by additive manufacturing method. The structure and lattice behaviors were investigated by Digital Image Correlation (DIC) system during experimental study. Models created using three different unit cell model as Trunch Octa Dense, Trunch Octa Light, Body Diagonals With Nodes and two different, 70 mm and 140 mm, total length size. The influence of the unit cell model, cell size on the strength of the structure were studied by compression and torsion experiments. The maximum compressive stress and maximum torsion were obtained and their deformations were presented. The highest maximum torque was determined in Body Diagonals With Nodes cell model and 140 mm due to the fact that the cell model structure compatible with torsion. The highest compressive stress was determined in Trunch Octa Light cell model and 140 mm cell length. © The Author(s) 2023.Öğe Optimization of parameters for drilling composite materials with freeform surfaces(Taylor & Francis Inc, 2024) Ozdemir, Burak; Kilickap, Erol; Bahce, Erkan; Yardimeden, Ahmet; Emir, EnderIn the drilling process, the angle of surface is one of the parameters that affect hole quality. In study, the effects of feed rate, spindle speed and surface angle on the thrust force, roughness, and delamination, which are the factors affecting the quality of hole, were investigated in the drilling of GFRP (glass fiber reinforced polymer) and CFRP (carbon fiber reinforced polymer) with freeform surfaces. With ANOVA (Analysis of Variance) and regression analysis, the parameter effects were statistically compared, and descriptive mathematical models were derived. The mathematical models were subjected to the Genetic Algorithm approach according to the different surface angles determined and the optimum parameter values were calculated. Guiding data were obtained about the effects of machining on hole quality in drilling composite at different surface angles, which is the main motivation of the study. Optimization results will improve hole quality on curved surfaces, while saving cost and time.
