Investigation of delamination factor in drilling sandwich structure composite

The objective of this work is to investigate the influence of cutting speed, feed rate, and tool diameter on the delamination damage of composite sandwich structure PVC foam and faces made of Glass/polyester. A design of experiments (full factorial) was used to assess the importance of the drilling parameters, and digital photography technique was used to evaluate the damages from drilling. The drilling operation was assessed based on one introduced factor like the delamination factor (DF). Analysis of the experimental results for DF indicated that feed rate and drill diameter were the most significant and insignificant parameters, respectively. Whereas increasing tool diameter leads to decrease of DF.