Shi Zhongmeng, Zou Chao, Zhou Feiyu, Zhao Jianping
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China.
Jiangsu Key Lab of Design and Manufacture of Extreme Pressure Equipment, Nanjing 211816, China.
Materials (Basel). 2022 Apr 16;15(8):2919. doi: 10.3390/ma15082919.
The UV durability of carbon fiber composites has been a concern. In this work, UV irradiation on carbon fiber-reinforced polymer (CFRP) materials was performed using an artificial accelerated UV aging chamber to investigate the effect of UV exposure on carbon fiber composites. UV aging caused some of the macromolecular chains on the surface resin to break, resulting in the loss of small molecules and loss of mass. After 80 days of UV irradiation exposure, a significant decline in the macroscopic mechanical properties occurred in the longitudinal direction, with the largest decrease of 23% in longitudinal compressive strength and a decreasing trend in the transverse mechanical properties at the later stage of aging. The microscopic mechanical properties of the CFRP specimens were characterized using nanoindentation, and it was found that UV aging had an embrittlement effect on the matrix, and its hardness/modulus values were higher than the initial values with UV exposure. The fibers were less affected by UV irradiation.
碳纤维复合材料的紫外线耐久性一直是个问题。在这项工作中，使用人工加速紫外线老化箱对碳纤维增强聚合物（CFRP）材料进行紫外线照射，以研究紫外线暴露对碳纤维复合材料的影响。紫外线老化导致表面树脂上的一些大分子链断裂，导致小分子损失和质量损失。经过80天的紫外线照射后，纵向宏观力学性能显著下降，纵向抗压强度最大下降23%，老化后期横向力学性能呈下降趋势。使用纳米压痕对CFRP试样的微观力学性能进行了表征，发现紫外线老化对基体有脆化作用，其硬度/模量值高于紫外线暴露后的初始值。纤维受紫外线照射的影响较小。
