Delamination analysis of drilling parameters on neem/banyan fiber-reinforced sawdust particulates hybrid polymer composite

The application and variety of composite materials have expanded across various domains, from everyday furniture to industrial structures. This study emphasizes delamination analysis in natural fiber-reinforced hybrid polymer composites crafted from neem, banyan fibers, and an epoxy matrix containing sawdust fillers during drilling. Drilling is vital for the assembly of composite components. The L27 factorial design orthogonal array was employed to examine three distinct spindle speeds, feed rates, and HSS drill bits used in the drilling operation. Using the response surface methodology (RSM), to determine optimal responses for thrust force, torque, and delamination during drilling. The surface quality, specifically delamination peel-up and push-out, of the drilled holes was gauged via digital microscopic examination across the entry and exit of the hybrid composite sample. The ANOVA results (p<0.04) indicated optimal drilling parameter is 6 mm drill bit diameter, 10 mm/rev feed rate, and a spindle speed of 1500 rpm. These conditions resulted in minimal delamination effects peel up and push out (0.87 and 0.91), a thrust force of 23.43 N, and torque of 5.13N-m. Overall, the study underscores the significance of drilling parameters in ensuring an efficient drilling process for this particular natural fiber composite.