Study the effect of delamination on new hybrid composite material during drilling process

This delamination at the hole entrance and exit zone when the hole is drilled by the FRP composites has negative impact on the surface quality of the hole and engineering properties of the FRP composites. The work examined the occurrence of delamination at the entrances and exits of holes when drilling carbon, glass fiber-reinforced matrix composite material. We conducted experiments for each of the drill diameters (1−2−3) mm, following the Taguchi L9 orthogonal array test design. We used three different cutting speeds (230–580–875 rev/min) and feed rates (25–100–175 mm/min) as our cutting parameters. The study revealed that type A-entrance, with a feed rate of 25 mm/min, a spindle speed of 875 rpm, and a drill diameter of 3 mm, achieves the smallest delamination factor of 1.46. Additionally, type B-entrance achieves a minimum delamination factor of 1.38 when the spindle rotates at a speed of 875 rpm, the input feed is 25 mm/min, and the drill diameter is 2 mm. The interaction plot between the rate of feed and the spindle speed moderately influences the delamination factor. Additionally, interactions between the spindle's rotation speed and the feed rate moderately influence the delamination factor. The diameter of the drill and the spindle's speed also play a significant role. Regression analysis led to the development of first-degree mathematical models for the entrance and exit delamination factors of each cutting tool. The obtained data revealed a high degree of coherence between the optimization, mathematical models, and experimental test results.