Synergistic influence of MWCNTs/RGO on low-velocity impact response and mechanical properties of carbon fiber/epoxy composite

Mohammad Amin Bahrami, Saeed Feli
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Abstract

Nanoparticles can be used to enhance and improve the mechanical properties and low-velocity impact response of carbon fiber-reinforced polymer (CFRP) composites both simultaneously and individually. Also, the synergistic influence of two nanoparticles can be improved the mechanical properties and low-velocity impact response of CFRP composites. In this paper, the effects of reduced graphene oxide (RGO) and multi-walled carbon nanotubes (MWCNTs) on the mechanical properties, low-velocity impact response and damage area of epoxy/fiber carbon composites are investigated both simultaneously and individually. Composite specimens are fabricated with 0.4 weight percentages (wt.%) of RGO, 0.06 wt.% of MWCNTs individually, and a combination of RGO and MWCNTs with 0.6 and 0.06 wt.%, respectively. For comparison of the results, the neat epoxy specimens are fabricated and also tested. Direct homogenization technique is applied for preparation of nanocomposite mixture and then each layer of carbon fiber reinforced nanocomposite is fabricated using a hand lay-up process. Tensile modulus, tensile strength, variations of load, displacement, velocity, and absorbed energy of specimens versus time are obtained. For specimens with MWCNTs/RGO tensile modulus and tensile strength increased by about 21.30% and 17.12%, respectively, and the load peak increased by 15.15% at 1 J, 13.35% at 2 J, 39.62% at 3 J, and 39.62% at 3 J. It is concluded that the synergistic influence of MWCNTs and RGO on the results is more significant and has a higher effect on the impact responses. After the impact tests, Optical microscopy and SEM method are used to analyze fracture surfaces.
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MWCNTs/RGO对碳纤维/环氧复合材料低速冲击响应和力学性能的协同影响
纳米颗粒可以同时或单独增强和改善碳纤维增强聚合物(CFRP)复合材料的力学性能和低速冲击响应。此外,两种纳米粒子的协同作用可以改善CFRP复合材料的力学性能和低速冲击响应。本文分别研究了还原氧化石墨烯(RGO)和多壁碳纳米管(MWCNTs)对环氧/纤维碳复合材料的力学性能、低速冲击响应和损伤面积的影响。复合材料样品分别以0.4重量百分比(wt.%)的RGO和0.06 wt.%的MWCNTs,以及分别以0.6和0.06 wt.%的RGO和MWCNTs的组合制备。为了比较结果,制作了纯环氧树脂试件并进行了试验。采用直接均质技术制备纳米复合材料,然后采用手工叠层法制备每一层碳纤维增强纳米复合材料。拉伸模量,拉伸强度,载荷变化,位移,速度,和吸收能量随时间的试样。添加MWCNTs/RGO的试件抗拉模量和抗拉强度分别提高了约21.30%和17.12%,在1 J、2 J、3 J和3 J时,载荷峰值分别提高了15.15%、13.35%、39.62%和39.62%。可见,MWCNTs和RGO对结果的协同影响更为显著,对冲击响应的影响更高。冲击试验结束后,采用光学显微镜和扫描电镜对断口进行分析。
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来源期刊
CiteScore
6.00
自引率
1.70%
发文量
24
期刊介绍: Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems is a peer-reviewed scientific journal published since 2004 by SAGE Publications on behalf of the Institution of Mechanical Engineers. The journal focuses on research in the field of nanoengineering, nanoscience and nanotechnology and aims to publish high quality academic papers in this field. In addition, the journal is indexed in several reputable academic databases and abstracting services, including Scopus, Compendex, and CSA's Advanced Polymers Abstracts, Composites Industry Abstracts, and Earthquake Engineering Abstracts.
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