Suresha R, Sachidananda H K, Shivamurthy B, Swamy N Kumar, Parasuram Sampath
School of Engineering & Information Technology, Department of Electrical & Electronics Engineering, Manipal Academy of Higher Education, Dubai, United Arab Emirates.
School of Engineering & Information Technology, Department of Mechanical Engineering, Manipal Academy of Higher Education, Dubai, United Arab Emirates.
Sci Rep. 2025 May 6;15(1):15735. doi: 10.1038/s41598-025-00634-x.
In this work, carbon fabric-reinforced epoxy (CF/E) and carbon fabric/graphene nanoplatelets (1 wt%, 2 wt% and 3 wt%) reinforced epoxy (CF/GNP/E) laminates (one-layer, two-layer, and four-layer) were prepared using the hand layup method. Further, according to ASTM standards, the test samples were machined using abrasive waterjet machining, and tensile properties and hardness were studied. It was found that tensile strength modulus and strain-to-failure improved due to the addition of GNPs into the epoxy matrix in the composite; the CF/1GNP/E composite showed the highest tensile strength modulus and strain-to-failure. Further addition of GNPs of more than 2 wt% deteriorates the mechanical properties due to agglomeration. The electromagnetic interference shielding effectiveness by absorption and reflection of all the samples was investigated using the measured S-parameters in an X-band frequency range. The effectiveness of electromagnetic interference shielding increased with the addition of GNPs, and the multi-layer structure in the composites showed absorption-dominated electromagnetic shielding. The CF/3GNP/E 4-layer composite showed the highest (32.4dB) shielding effectiveness and was recommended for commercial application in the X-band frequency range.
在本工作中，采用手糊法制备了碳纤维织物增强环氧树脂（CF/E）以及碳纤维织物/石墨烯纳米片（1 wt%、2 wt%和3 wt%）增强环氧树脂（CF/GNP/E）层压板（单层、两层和四层）。此外，根据ASTM标准，使用磨料水射流加工对测试样品进行加工，并研究其拉伸性能和硬度。结果发现，由于在复合材料的环氧树脂基体中添加了石墨烯纳米片，拉伸强度模量和断裂应变得到了提高；CF/1GNP/E复合材料表现出最高的拉伸强度模量和断裂应变。进一步添加超过2 wt%的石墨烯纳米片会因团聚而使力学性能恶化。利用在X波段频率范围内测得的S参数，研究了所有样品通过吸收和反射的电磁干扰屏蔽效能。电磁干扰屏蔽效能随石墨烯纳米片的添加而增加，复合材料中的多层结构表现出以吸收为主的电磁屏蔽。CF/3GNP/E四层复合材料表现出最高的屏蔽效能（32.4dB），并被推荐用于X波段频率范围的商业应用。
