Akademik Veri Yönetim Sistemi
Arabian Journal for Science and Engineering, 2024 (SCI-Expanded)
In this study, Taguchi optimization was employed to analyze the micro-drilling of carbon and hybrid (carbon-aramid) epoxy composites. These composites were micro-drilled and the analysis of composites focused on thrust force, tool temperature, overcut, hole damage factor (HDF), and taper ratio. In addition to these parameters, micro-hole cross sections were evaluated by SEM. Micro-holes were drilled on plates with thicknesses of 3.05 mm (carbon fiber) and 3.45 mm (hybrid) using a Taguchi orthogonal array (L9) design. ANOVA and Taguchi analysis revealed that tool diameter significantly impacts overcut, HDF, and taper ratio in all composites. Tool diameter also influences the taper ratio, overcut, HDF by 90%, 70%, and 40%, respectively. Spindle speed is the second most impactful parameter, while feed rate is the least effective. Optimum control levels for carbon composite micro-drilling were identified as A3-B3-C2 (0.7 mm, 15,000 rpm, and 1.0 mm/min); for hybrid composite, A3-B3-C3 (0.7 mm, 15,000 rpm, and 1.5 mm/min). Tool verification experiments showed temperatures of 81.2 °C in carbon composite and 84.3 °C in hybrid composite. SEM images depict delamination, intralaminar cracks, fiber pullouts, and breakages in composites at high cutting rates, distinguishing between brittle failure in carbon composites and mixed failure modes in hybrid composites. These results provide to the industry with useful data that could potentially utilized for producing high-quality micro-drilled composites with possibly lower manufacturing costs.