Abstract
In the pursuit of mitigating or eradicating thermal damage defects during laser processing of carbon fiber-reinforced polymers (CFRP), the application of picosecond lasers with ultra-short pulse durations has emerged as a promising approach. Despite the adoption of picosecond lasers, the occurrence of thermal damage defects in CFRP processing persists. As a result, a more comprehensive comprehension of the mechanisms behind thermal damage formation and material removal in picosecond laser processing of CFRP is imperative. This study utilizes a picosecond laser at a wavelength of 532 nm to scribe the surface of braided CFRP. The focus is primarily on analyzing the mechanisms of thermal damage formation and material removal. Specifically, the effects of single-pulse energy density, line energy, and number of pulses in the spot range controlled by the process parameters on thermal damage and dimensional characteristics of the groove are evaluated. The results indicate that ablation, combustion and mechanical effects are the main forms of CFRP removal. Simultaneously, the groove also presents typical thermal damage defects as carbon fiber pull-out, heat-affected zone (HAZ), cracks, etc.. Furthermore, this study introduces a pioneering theoretical analysis of the effects of process parameter variations on effective thermal efficiency and the evolution of surface HAZ. This study contributes to the enhancement of the control capabilities against thermal damage in picosecond laser processing of CFRP, offering a crucial theoretical framework for further advancements in this domain.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
This work was financially supported and funded by Guangxi Science and Technology Base and Talent Project (Guike AD21238020), Guangxi Natural Science Foundation (2021GXNSFBA075031), the National Natural Science Foundation of China (NSFC) (62274045, 62004050, 52165056), Guangxi Key Laboratory of Manufacturing Systems and Advanced Manufacturing Technology (17-259-05-018Z), Guangxi Young Teacher Education Project (2020KY05020), the Innovation Project of Guangxi Graduate Education (YCSW2022287, YCBZ2022114, YCBZ2021073), the GUET Excellent Graduate Thesis Program (19YJPYBS02), the Innovation Project of GUET Graduate Education (2020YCXS010, 2021YCXS001), the project of improving the basic research ability of young and middle-aged teachers in Guangxi universities (2022KY0201, 2022KY0178).
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HJ: Investigation, formal analysis, writing—original draft; ZL: investigation, data curation; GZ: investigation, data curation; JZ: writing—review and editing, project administration; YH: writing—review and editing, project administration; YL: writing—review and editing, project administration, funding acquisition.
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Jiao, H., Lin, Z., Zhang, G. et al. Scribing of surface-braided CFRP with picosecond laser: Thermal damage formation and removal mechanism analysis. Appl. Phys. A 130, 120 (2024). https://doi.org/10.1007/s00339-023-07216-6
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DOI: https://doi.org/10.1007/s00339-023-07216-6