Optimization and alternative image processing approach for the comprehensive assessment of delamination and uncut fiber in drilling fiber metal laminate

In this study, hole exit delamination and uncut fiber ( UCF ) formation in the drilling of carbon fiber-reinforced aluminum laminates (CARALL) were investigated. The adjusted delamination factor ( F da ) was used to assess delamination. The experiments were carried out using a brad spur drill (Tool 1), a twist drill (Tool 2), and a dagger drill (Tool 3) tool. A multi-mapped image processing model (MMIPM) was developed for an advanced and comprehensive delamination assessment in images by evaluating F da and UCF parameters. In order to provide more information about the preferential orientation of delamination, in addition to F da , conventional delamination factor ( F d ) and minimum delamination factor ( F dmin ) were calculated and a comparison of all delamination approaches was performed. Furthermore, the PROMETHEE-GAIA method was used to perform multi-objective optimization of F da and UCF . The minimum F da and UCF values were achieved with the twist drill (Tool 2). V c = 118 m/min and f = 0.156 mm/rev were optimal conditions for minimum F da and UCF .