Process optimization and performance verification of CFRP laser surface modification

作者：Shaolong Li, Wenxuan Wang, Lin Wang, Zihao Li, Zhan Teng, Yikai Yang, Chenyang Zhang, Yue Hu, Lijun Feng, Disheng Wang, Wenfeng Yang · 发表于：Polymer Composites · 年份：2024 · DOI：10.1002/pc.28265 · 被引用次数：25 · 研究领域：Manufacturing Process and Optimization、Additive Manufacturing and 3D Printing Technologies、Advanced Surface Polishing Techniques

Abstract Adhesive bonding has gradually replaced mechanical connections as the primary method for composite material bonding, with surface quality being the key factor determining the effectiveness of composite material adhesion. Laser surface treatment, known for its green and precise characteristics, has garnered widespread attention from both academia and industry. However, the process parameters of laser surface treatment are complex, efficiency is low, and the mechanism remains unclear. This paper, based on the response surface methodology (RSM), investigates the influence of laser secondary parameters on the resin removal rate of carbon fiber reinforced polymer/plastic (CFRP) surfaces and the impact of defocusing on surface treatment efficiency. The results indicate that when the total laser energy density (E t ) is 69 J/cm 2 , the overlap ratio in the warp direction (OL s ) is 76%, and the overlap ratio in the weft direction (OL h ) is 85%, the surface tensile shear strength increases by 90.59% and 27.77% compared to the original surface and polished surface, respectively. When the defocus distance is +8 mm, the efficiency of laser surface treatment is 2.25 times that of non‐defocus, with minimal impact on mechanical performance. The surface treatment mechanism, with changes in E t , primarily involves the pure thermal decomposition of the resin matrix in an oxygen‐free environment, oxidative decomposition, and the synergistic action of the decomposition products' oxid...