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<p>This study investigates the effects of power density and scanning speed of a near-infrared high-repetition-frequency nanosecond pulsed laser on the quality and efficacy of paint removal from CFRP surfaces. Surface morphology, residual substances, and fiber fracture were evaluated, and a power density of 80&#xa0;kW/cm² combined with a scanning speed of 720&#xa0;mm/s was identified as the optimal parameter set, achieving complete removal of paint and resin without inducing carbon fiber damage. A two-dimensional thermal–mechanical model was developed to simulate the relationships among process parameters, temperature distribution, and cleaning depth. Experimental and numerical simulations were jointly used to elucidate the characteristics and mechanisms of paint removal, residual formation, and fiber damage. The results show that fiber damage arises from the coupled effects of airflow generated during resin pyrolysis and thermally induced stress, while plasma shielding and oxidation at low scanning speeds may promote the formation of new residues. Both experimental and simulation results confirm that thermal ablation and thermal stress-induced peeling constitute the primary mechanisms governing laser paint removal. The research results provide experimental and theoretical basis for understanding the process and mechanisms of laser paint removal on CFRP surfaces.</p>

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Experimental and Simulation Study on Removal of CFRP Surface Paint by High-Repetition-Frequency Pulsed Laser

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Lin Li,
  • Daoxin Li,
  • Meng Wu,
  • Biyi Wang,
  • Wanli L. Zhao,
  • Yong Jiang

摘要

This study investigates the effects of power density and scanning speed of a near-infrared high-repetition-frequency nanosecond pulsed laser on the quality and efficacy of paint removal from CFRP surfaces. Surface morphology, residual substances, and fiber fracture were evaluated, and a power density of 80 kW/cm² combined with a scanning speed of 720 mm/s was identified as the optimal parameter set, achieving complete removal of paint and resin without inducing carbon fiber damage. A two-dimensional thermal–mechanical model was developed to simulate the relationships among process parameters, temperature distribution, and cleaning depth. Experimental and numerical simulations were jointly used to elucidate the characteristics and mechanisms of paint removal, residual formation, and fiber damage. The results show that fiber damage arises from the coupled effects of airflow generated during resin pyrolysis and thermally induced stress, while plasma shielding and oxidation at low scanning speeds may promote the formation of new residues. Both experimental and simulation results confirm that thermal ablation and thermal stress-induced peeling constitute the primary mechanisms governing laser paint removal. The research results provide experimental and theoretical basis for understanding the process and mechanisms of laser paint removal on CFRP surfaces.