Drilling is most widely applied to composite materials; nevertheless, the damage induced by this operation on composite materials may reduce drastically the component performance. In order to establish the damage level, delamination is measured quantitatively using digital means. A comparison between the conventional (FD) and adjusted (FDA) delamination factor is presented. In order to quantify the delamination effectively, ‘a refined delamination factor (FDR)’ is proposed. The accuracy of the proposed criteria is validated using experimental results.
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