Wang Li, Tang Jinpeng, Jin Kai, Yankey Richmond Polley, Berti Guido A, Quagliato Luca
College of Materials Science and Engineering, Ocean University of China, Qingdao, P.R. China.
, 238 Songling Road, Laoshan District, Qingdao, Shandong Province, People's Republic of China.
Sci Rep. 2024 Oct 4;14(1):23135. doi: 10.1038/s41598-024-73227-9.
STUDY ON STATIC IN-SITU CURING CHARACTERISTICS OF CFRP BASED ON NEAR INFRARED LASER: The quick curing method of carbon fibre reinforced plastics (CFRP) is one of the hotspots in current research. A static in-situ curing method for CFRP prepreg based on near-infrared laser was put forward in this study. The in-situ curing structural characteristics and the mechanism of CFRP were investigated through real-time surface temperature measurement, COMSOL temperature field simulation, 3D measurement of curing morphology and resin curing degree test. The thermal conductivity of the CFRP along the fiber direction is considerably higher than that along the perpendicular fiber direction. As a result, the temperature profile in the plane takes on an elliptical shape. During the transfer, the temperature field gradually decreases, resulting in an ellipsoidal 3D high-temperature distribution. The different shrinkage phenomena in the different curing regions between the layers lead to an irregular ellipsoidal solidification morphology of the unidirectional CFRP. The temperature in the center of the heat affected zone increases as a power exponential function with time. The area and depth of the heat-affected zone increases with the laser power, and the curing area is positively correlated with the degree of curing. As a result, curing temperature governing equations based on laser power and layer thickness have been proposed, while relationship equations based on laser power, curing depth and curing morphology have been developed. In addition, prediction equations based on curing morphology have been developed for curing degree, in order to achieve precise curing of CFRP.
基于近红外激光的碳纤维增强塑料（CFRP）静态原位固化特性研究：碳纤维增强塑料（CFRP）的快速固化方法是当前研究的热点之一。本研究提出了一种基于近红外激光的CFRP预浸料静态原位固化方法。通过实时表面温度测量、COMSOL温度场模拟、固化形态的三维测量和树脂固化度测试，研究了CFRP的原位固化结构特性和机理。CFRP沿纤维方向的热导率明显高于沿垂直纤维方向的热导率。因此，平面内的温度分布呈椭圆形。在传递过程中，温度场逐渐降低，形成椭圆形的三维高温分布。层间不同固化区域的不同收缩现象导致单向CFRP呈现不规则的椭圆形固化形态。热影响区中心的温度随时间呈幂指数函数增加。热影响区的面积和深度随激光功率增加，固化面积与固化程度呈正相关。因此，提出了基于激光功率和层厚的固化温度控制方程，同时建立了基于激光功率、固化深度和固化形态的关系方程。此外，还建立了基于固化形态的固化度预测方程，以实现CFRP的精确固化。
