Examining the impact of fiber orientation angle and drilling parameters on the quality of holes in GFRP pipes

This 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°, 60°, and 90°. 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° generated increased thrust force while reducing roughness and delamination in comparison to other orientation angles. At a 90° orientation angle relative to 30° and 60°, 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.