New analytical model for delamination of CFRP during drilling

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• 作者：Franck Girot ; Pr.^a ; ^d ; ^{frank.girot@ehu.eus" class="auth_mail" title="E-mail the corresponding author} ; ^{franck.girot@ensam.eu" class="auth_mail" title="E-mail the corresponding author} ; Fré ; dé ; ric Dau^c ; ^{frederic.dau@ensam.eu" class="auth_mail" title="E-mail the corresponding author} ; Mª ; Esther Gutié ; rrez-Orrantia^b ; ^{esther.gutierrez@ehu.eus" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Carbon fiber reinforced polymer ; Delamination ; Analytical modelling ; Machining
• 刊名：Journal of Materials Processing Technology
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：240
• 期：Complete
• 页码：332-343
• 全文大小：2624 K

文摘

Drilling of composite material structure is a widely used process in aeronautical assembly due to its best manufacturing value (ratio quality/cost). However, delamination which can be generated at the hole exit is still a problem and is directly related to the drill axial force, the composite material mechanical characteristics and the load distribution along the cutting and chisel edges. This paper analyzes the distribution of the load along the drill edges and points out a triangular distribution associated to an additional load located at the centre of the drill. This additional load depends strongly on the feed rate. An orthotropic analytical model is then proposed in order to determine the delamination critical thrust during drilling for different combined loadings. This new model is compared with the existing ones in the literature and with experimental results. This analysis highlights that delamination occurs in a mixed mode and not in mode I only. The use of the B-K criterion for the determination of the equivalent critical energy release rate G_C and a cutting edge combined loading (triangular distribution associated to an additional load) allow a close correlation between experimental measurements and the prediction of this new model.