Yazar "Biberci, Mehmet Ali" seçeneğine göre listele

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    Assessment of the influence of abrasive water jet drilling parameters on glass fiber-reinforced polymer composites
    (Sage Publications Ltd, 2025) Karatas, Meltem Altin; Gokkaya, Hasan; Akincioglu, Sitki; Biberci, Mehmet Ali
    In this study, the effect of abrasive waterjet (AWJ) drilling of glass fiber-reinforced polymer (GFRP) composites (0 degrees/90 degrees fiber orientations) on the kerf taper (T) and roundness error (Re) of the holes was investigated. The experiments were carried out using an abrasive waterjet designed with a Taguchi L16 orthogonal array. The following waterjet processing parameters were selected: water pressure, stand-off distance, and feed rate. Statistical analyses were conducted using analysis of variance (ANOVA), signal-to-noise (S/N) ratios, and Taguchi-based gray relational analysis (GRA) to investigate the effects of processing parameters on kerf taper and roundness error. An Artificial Neural Network (ANN) model was created for the estimation of the experimental data, and the generated model was executed with minimum error and maximum accuracy. The analysis revealed that water pressure was the most influential parameter, contributing 87.75% to Re and 85.15% to T, followed by stand-off distance (11.00% for Re and 13.02% for T). Based on the parameters selected through GRA, the optimum conditions (5300 bar water pressure, 1 mm stand-off distance, 3000 mm/min traverse feed rate, 10 mm hole diameter) produced a minimum Re of 0.709 mm and a T of 0.420 degrees.
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    Investigation of the effect of AWJ drilling parameters for delamination factor and surface roughness on GFRP composite material
    (Emerald Group Publishing Ltd, 2022) Altın Karataş, Meltem; Gökkaya, Hasan; Akıncıoğlu, Sıtkı; Biberci, Mehmet Ali
    Purpose The purpose of this study is to optimize processing parameters to get the smallest average surface roughness (Ra) and delamination damage (F-d) values during drilling via abrasive water jet (AWJ) of the glass fiber-reinforced polymer composite material produced at [0 degrees/90 degrees](s) fiber orientation angles. Design/methodology/approach Drilling experiments were done via AWJ with three-axis computer numerical control (CNC) control system. Machine processing parameters such as water pressure of 3,600, 4,300, 4,800 and 5,300 bar; stand-off distance of 1, 2, 3 and 4 mm; traverse rate of 750, 1,500, 2,000 and 3,000 mm/min; and hole diameters of 8, 10, 12 and 14 mm have been selected. The effects of processing parameters in drilling experiments were investigated in conformity with the Taguchi L-16 orthogonal array and the data obtained were analyzed using Minitab 17 software. The signal/noise (S/N) ratio was taken as a basis for evaluating the test results. Optimum processing conditions were determined by calculating the S/N ratio for both Ra and F-d in conformity with the smaller is better approximation. The effects of processing parameters on Ra and F-d were statistically investigated using analysis of variance, S/N ratio and Taguchi-based gray relational analysis. Ra and F-d were predicted by evaluating with the ANN model and were predicted with the least amount of error. Findings It has been determined that the most effective parameter for Ra and F-d is the water pressure and then the stand-off distance. Originality/value The novel approach is to reduce cost and the time spent by using Taguchi optimization as a result of AWJ drilling the material in this fiber orientation [0 degrees/90 degrees](s).