High-power fiber laser has been proven to be feasible for cutting carbon fiber reinforced polymers with several advantages including noncontact force, high efficiency and flexibility, while the characteristics of thermal damage and heat conduction in materials are not yet fully understood. Continuous-wave fiber laser was applied in this work to cut 2.0-mm-thick carbon fiber reinforced polymer laminates with different layup configurations. The influence of processing parameters including laser power and cutting speed on thermal damage was investigated. The characteristics of various thermal defects on different positions of machined surface were analyzed using high-resolution SEM and mathematical models. Interestingly, swollen fibers were observed and they connected together to form irregular swollen masses. According to further analysis on the initial heat distribution, it showed that cutting speed was the main factor affecting heat accumulation. In addition, modified heat conduction model was developed to analyze heat transfer within unidirectional carbon fiber reinforced polymer laminates in comparison with experimental results, which can be applied to predict heat affect zone during high-power fiber laser cutting composite materials.

中文翻译：

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纤维激光切割碳纤维增强聚合物层压板过程中的热缺陷表征和导热建模

高功率光纤激光器已被证明可用于切割碳纤维增强聚合物，具有非接触力，高效和柔韧性等优点，而材料的热损伤和导热特性尚未得到充分理解。在这项工作中使用了连续波光纤激光器，以切割具有不同铺层配置的2.0毫米厚的碳纤维增强聚合物层压板。研究了包括激光功率和切割速度在内的加工参数对热损伤的影响。使用高分辨率SEM和数学模型分析了加工表面不同位置上各种热缺陷的特征。有趣的是，观察到肿胀的纤维，它们连接在一起形成不规则的肿块。通过对初始热量分布的进一步分析，发现切削速度是影响热量积累的主要因素。此外，还开发了改进的导热模型来分析单向碳纤维增强聚合物层压板中的传热，并与实验结果进行比较，可用于预测大功率纤维激光切割复合材料过程中的热影响区。