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Numerical Investigation of Delamination in Drilling of Carbon Fiber Reinforced Polymer Composites

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Abstract

Drilling of carbon fiber reinforced polymer (CFRP) is a challenging task in modern manufacturing sector and machining induced delamination is one of the major problems affecting assembly precision. In this work, a new three-dimensional (3D) finite element model is developed to study the chip formation and entrance delamination in drilling of CFRP composites on the microscopic level. Fiber phase, matrix phase and equivalent homogeneous phase in the multi-phase model have different constitutive behaviors, respectively. A comparative drilling test, in which the cement carbide drill and unidirectional CFRP laminate are employed, is conducted to validate the proposedmodel in terms of the delamination and the similar changing trend is obtained. Microscopic mechanism of entrance delamination together with the chip formation process at four special fiber cutting angles (0°, 45°, 90° and 135°) is investigated. Moreover, the peeling force is also predicted. The results show that the delamination occurrence and the chip formation are both strongly dependent on the fiber cutting angle. The length of entrance delamination rises with increasing fiber cutting angles. Negligible delamination at 0° is attributed to the compression by the minor flank face. For 45° and 90°, the delamination resulted from the mode III fracture. At 135°, serious delamination which is driven by the mode I and III fractures is more inclined to occur and the peeling force reaches its maximum. Such numerical models can help understand the mechanism of hole entrance delamination further and provide guidance for the damage-free drilling of CFRP.

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Acknowledgements

The authors gratefully acknowledge the financial support for this work by the National Natural Science Foundation of China (No.51375234).

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Wenliang Tang, Yan Chen, Haojun Yang, Hua Wang & Qiwei Yao

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Correspondence to Yan Chen.

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Tang, W., Chen, Y., Yang, H. et al. Numerical Investigation of Delamination in Drilling of Carbon Fiber Reinforced Polymer Composites. Appl Compos Mater 25, 1419–1439 (2018). https://doi.org/10.1007/s10443-018-9675-3

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