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Experimental research on the matrix cracks and delamination distribution and their monitoring methods during drilling UD-CFRP

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Abstract

Although carbon fiber reinforced polymer (CFRP) has been widely used in various applications, it is still regarded as a kind of difficult-to-cut material due to its vulnerability to machining damages. In the current research, CFRP drilling experiments were conducted, and the matrix cracks and delamination were observed not only at the entrance and exit of holes, but also in the middle area of the holes. Therefore, it is necessary to study the distribution of these damages due to the severe effect on the mechanical properties of CFRP. In this paper, the distribution of these damages as well as their monitoring methods were investigated. First, four factors were introduced to locate the distribution of these damages that were observed by X-ray CT scanner. Then, statistical process control (SPC) was applied for damage detection with features optimized sensitivity analysis. Finally, the performance of SPC was validated, which has a high damage identifying accuracy of 86.78% and recommended for the on-line application.

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Acknowledgements

The authors would like to acknowledge the financial support from “National Nature Science Foundation of China (52075380 by Shipeng Li and 5227545 by Xuda Qin)” and the “Natural Science Foundation of Tianjin (21JCYBJC00610 by Shipeng Li).”

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WL: investigation, experimental design, experimental data analysis, processing signals, coding, writing, and editing. XQ: experimental design, review and editing. SL: experimental design, review, and editing. XW: preparation of experimental materials, review, and editing.

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Correspondence to Shipeng Li.

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Liu, W., Qin, X., Li, S. et al. Experimental research on the matrix cracks and delamination distribution and their monitoring methods during drilling UD-CFRP. Int J Adv Manuf Technol 130, 1595–1615 (2024). https://doi.org/10.1007/s00170-023-12733-y

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