Minimizing Push-out Delamination in Glass Fiber Reinforced Polyester Using RSM
K.W. LIEW*, A. Ramasegar, M. Souiyah, N.S.M. El-Tayeb

Abstract
Delamination of glass fiber reinforced polymer (GFRP) was studied using face centered central composite design (CCD) of Response Surface Methodology (RSM). The parameters investigated were drill diameter (4.5-11.5mm), speed (580-1420rpm) and feed rate (83-167mm/min). Mathematical models were developed and verified with confirmation runs. The statistical significance of main parameters and their interactions were determined using Analysis of Variance (ANOVA). Drilling of GFRP was performed using a CNC machine under dry conditions. The results showed that feed rate and speed were significant in influencing the formation of push-out delamination. Delamination occurs least when speed is high and feed rate is low.

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