Effects of exit back-up on delamination in drilling composite materials using a saw drill and a core drill

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Modeling and tool wear in drilling of CFRP (2010, unknown): “Tsao and Hocheng [15] analyzed the effect of a backup plate on delamination.”
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].”
Drill geometry and operating effects when cutting small diameter holes in CFRP (2009, background): “Alternatively, the use of backup material such as the deployment of aluminium layers provides less workpiece damage with the possibility of increased productivity through higher feed rates [14].”
Delamination analysis of carbon fibre reinforced laminates: Evaluation of a special step drill (2009, background): “Tsao and Hocheng [29] evaluated the delamination factor results when using three different drills and images obtained from ultrasonic C-scan.”