Comprehensive analysis of delamination in drilling of composite materials with various drill bits

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Experimental study of drilling composite materials with step-core drill (2008, background): “Pre-drilled, back-up plates and special drills can reduce delamination when drilling composite materials [5–13].”
Drilling of polymer matrix composites: A review (2013, background): “These parts extrude the material, instead of cutting through it.(1,53) When the feed becomes too high, the whole drill point acts as a punch that pierces the laminate.”
Modeling and tool wear in drilling of CFRP (2010, positive): “The delamination phenomenon has been extensively described in the literature [11,12,14–16,24,25] and depends significantly on the axial load applied to the material and the mechanical characteristics of the remaining material to drill (the final plies of the laminate) [11,12,14–16,24,25].”
Effects of special drill bits on drilling-induced delamination of composite materials (2006, background): “The critical thrust forceðFSÞ at the onset of crack propagation can be derived [58]: FS 1⁄4 p ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi 32GICM ð1 2s2 þ s4Þ s , (2)”
Optimization of process parameters in drilling of GFRP composite using Taguchi method (2014, methodology): “[12] Hocheng H, Tsao CC. Comprehensive analysis of delamination in drilling of composite materials with various drill bits.”