Akademik Veri Yönetim Sistemi
İmalat Teknolojileri ve Uygulamaları, cilt.6, sa.3, ss.272-286, 2025 (TRDizin)
Fused Filament Fabrication (FFF), one of the most widely used additive manufacturing methods, is of critical importance in structural applications requiring lightweight, strength, and design flexibility, especially with carbon fiber-reinforced polylactic acid (PLA-CF) composites. This study investigates the effects of infill density (30–70–100%), raster angle (0°–22.5°–45°), and build orientation (0°–45°–90°) on the flexural strength and hardness of PLA-CF samples using a Box-Behnken design. Response Surface Methodology (RSM) and Analysis of Variance (ANOVA) were applied to develop predictive models and evaluate parameter interactions quantitatively. Among the parameters, infill density had the most pronounced effect, contributing 73.29% to the variation in flexural strength. Optimal performance was achieved with 100% infill density, a raster angle of 31.36°, and a build orientation of 0°. The developed models demonstrated high accuracy with R² values of 97.19% for flexural strength and 99.57% for hardness. Validation experiments revealed deviations of 10.63% (flexural strength) and 9.20% (hardness) from model predictions, confirming the robustness of the statistical models. The novelty of this work lies in systematically demonstrating the influence of different printing variations on the mechanical performance of PLA-CF composites and defining the optimum printing parameters through a combination of experimental and statistical approaches. These findings provide comprehensive research for the reliable use of PLA-CF composites in load-bearing structural applications.