The path towards delamination-free drilling of composite materials

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Drilling of polymer matrix composites: A review (2013, methodology): “Pilot hole and step drill were used by many investigators for this purpose.(13,28,44,59,63) The pilot hole diameter should be able to cancel the chisel edge effect which is largely responsible for the extrusion mechanism that occurs during laminate drilling.”
Drill geometry and operating effects when cutting small diameter holes in CFRP (2009, background): “Special drill geometries such as saw, candlestick, core and stepped configurations, have been shown to produce lower delamination compared to that produced by conventional twist drills [11,12].”
Natural fiber–reinforced composites: A review on material, manufacturing, and machinability (2019, background): “The most outstanding comparative advantage of USD compared to other techniques is it neither generates thermal, chemical or metallurgical damage on the workpiece nor produces remarkable residual stress, either aspect is substantial for the reliability in service.(10) However, the setbacks of modern ”
Delamination analysis of carbon fibre reinforced laminates: Evaluation of a special step drill (2009, background): “A comprehensive summary of the steps towards free-delamination holes can be found in [23].”