A novel approach based on digital image analysis to evaluate the delamination factor after drilling composite laminates

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Delamination analysis of carbon fibre reinforced laminates: Evaluation of a special step drill (2009, methodology): “Digital images are also used to assess this type of damage after drilling [24].”
Drilling in carbon/epoxy composites: Experimental investigations and finite element implementation (2013, methodology): “Various experimental studies were carried out in the past [4, 7, 14, 20-24] to optimise the machining parameters in order to obtain better performance in drilling of CFRP composites.”
The fatigue of carbon fibre reinforced plastics - A review (2019, background): “Delaminations can be triggered by fatigue loads as it is almost impossible at present, to manufacture a composite without defects generated either during the curing process or during machining [275].”
Recent advances in drilling hybrid FRP/Ti composite: A state-of-the-art review (2016, background): “the maximum diameter (Dmax) of the delamination area to the hole nominal diameter (Dnom)), two-dimensional delamination factor (DRAT or DF) [17,83,84] (denote the delamination evaluation based on the two-dimensional scale: area) and adjusted delamination factor (Fda) [85] (signify the comprehensive ”