Femtosecond laser processing is a high-precision method for processing Carbon Fiber Reinforced Polymer (CFRP) composites due to its high peak power and short pulse duration, resulting in low damage. This method holds great potential for application in the aerospace industry. This paper investigates the ultrafast dynamic response mechanism of the polymer matrix (resin matrix) within CFRP composites under femtosecond laser irradiation using a numerical model. The computation of the evolution of electron density in the resin material under femtosecond laser irradiation and the analysis of trends in instantaneous local optical property changes are presented. The prediction of ablation morphology of the resin matrix under different fluences is also included. This study offers guidance for femtosecond laser surface cleaning of CFRP composites.
Carbon fiber reinforced polymer (CFRP) is widely used in aerospace, transportation and other fields due to its excellent material properties. In order to improve the adhesive bond strength of CFRP composites, surface treatment is particularly important. In this study, femtosecond laser was used to treat the surface of aerospace high modulus CFRP composites, and the changes of resin removal and micro/nano structure of carbon fiber with laser fluence were investigated. It was found that the improvement of wettability was more favorable under the condition of removing the ablated resin and forming the complete micro/nano structure on the surface of carbon fiber. Through optimization, changing the laser fluence used in surface treatment, the water contact angle of the treated surface was reduced from 111.9° to 7.5°, greatly increasing the hydrophilicity of the surface, significantly enhancing the ductility of the surface liquid, which is expected to promote the flow and penetration of the adhesive on the surface, and further enhance the bond strength.
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