Evaluation of Delamination Factor in the Drilling of Sandwich Composites through Grey Relational Analysis
The delamination factor (DF) forming at the entry and exit areas of the hole in the drilling of CFRP/honeycomb sandwich composite with different drill geometries and under different cutting conditions was analyzed in this study. Three different drill geometries, three different cutting speeds (70, 100, and 130 m/min), and two different feed rates (0.05 and 0.07 mm/rev) were used as the controlling factors in the experiment design carried out using Taguchi method. An analysis of variance (ANOVA) with a confidence level of 95% was carried out to determine the effects of the controlling factors. Moreover, grey relational analysis (GRA) was carried out to determine the optimal parameter for the minimum value of entry and exit DF. According to the ANOVA results, the interaction between feed rate/drill geometry was observed to be the most influential parameter on entry DF with a content rate of 54.7%. Drill geometry became the most influential parameter on exit DF with a content rate of 39.9%. The optimal parameter for minimum entry and exit DF was determined as A1B3C1 as a result of GRA.
Authors: Ergün Ekici, Abdil Kus, İsmail Durgun
Conference: SAMPE Europe Conference 2016