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Open AccessArticle

Investigation on the Continuous Wave Mode and the ms Pulse Mode Fiber Laser Drilling Mechanisms of the Carbon Fiber Reinforced Composite

by Xiao Li 1,2, Wentao Hou 3, Bing Han 2,4,5,*, Lingfei Xu 4,5, Zewen Li 2, Pengyu Nan 1,2 and Xiaowu Ni 1,2
1
School of Science, Nanjing University of Science & Technology, Nanjing 210094, China
2
MIIT Key Laboratory of Advanced Solid Laser, 2011 Co-innovation Center, Nanjing University of Science & Technology, Nanjing 210094, China
3
Shanghai Academy of Spaceflight Technology, Shanghai 201109, China
4
Joint International Research Laboratory of Laser-based Manufacturing and Material Processing, Nanjing University of Science & Technology, Nanjing 210094, China
5
Shanghai Institute of Electrical and Mechanical Engineering, Shanghai 200030, China
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(3), 706; https://doi.org/10.3390/polym12030706
Received: 11 January 2020 / Revised: 8 March 2020 / Accepted: 16 March 2020 / Published: 23 March 2020
(This article belongs to the Special Issue Laser Processing of Polymer Materials)
The near infrared (NIR) laser drilling of a carbon fiber reinforced polymer (CFRP) composite in the continuous wave (CW) mode and the ms pulse mode was investigated by an experiment and a numerical simulation. The relationships between the laser penetrating time, entrance hole diameter, surface heat affected zone (HAZ) width, and material ablation rate and the laser irradiation time and laser peak power densities were obtained from the experiment. For the same average power density of the laser output, 3.5 kW/cm2, it was found that the ms pulse laser mode, which had a higher peak power density, had a higher drilling efficiency. When drilling the same holes, the pulse laser mode, which had the highest peak power density of 49.8 kW/cm2, had the lowest drilling time of 0.23 s and had the smallest surface HAZ width of 0.54 mm. In addition, it was found that the laser penetrating time decreased sharply when the peak power density was higher than 23.4 kW/cm2. After analyzing the internal gas pressure by the numerical simulation, it was considered that a large internal gas pressure appeared, which resulted from polymer pyrolysis, causing a large amount of the mechanical erosion of the composite material to improve the drilling efficiency. Therefore, the ms pulse laser showed its potential and advantage in laser drilling the CFRP composite. View Full-Text
Keywords: laser drilling; ms pulse; peak power density; surface HAZ; mechanical erosion laser drilling; ms pulse; peak power density; surface HAZ; mechanical erosion
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MDPI and ACS Style

Li, X.; Hou, W.; Han, B.; Xu, L.; Li, Z.; Nan, P.; Ni, X. Investigation on the Continuous Wave Mode and the ms Pulse Mode Fiber Laser Drilling Mechanisms of the Carbon Fiber Reinforced Composite. Polymers 2020, 12, 706.

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