论文标题
了解用碳纳米管面纱的单向CFRP层压板的层间韧性
Understanding interlaminar toughening of unidirectional CFRP laminates with carbon nanotube veils
论文作者
论文摘要
纳米结构层的引入是结构复合材料中层间增强的最有希望的策略之一。在这项工作中，我们研究了使用工业化旋转过程生产的碳纳米管面纱的稀薄面纱，研究了航空级结构复合材料的故障机理和层间微观结构。使用热压方法制备了与不同组成CNT面纱交织的单向碳纤维/环氧基质复合材料的样品，并测试了在模式I（打开）和模式-II（开放）和模式II（平面剪切）中测量的层间断裂韧性（IFT），以及用于层间剪切强度（ILS），Short Short（ILS），Short Short（ILS），以下简短的测试。裂纹传播模式可以通过通过电子显微镜和拉曼光谱的树脂/CNT空间歧视来直接确定裂纹传播模式，表明层间加强与在层间区域的凝聚/粘合剂失败模式之间的平衡之间存在明显的相关性。 CNT面纱的全树脂浸润的复合材料会大大增加II II IFT（88％）至1500 J/m2，并略有增强明显的层间剪切强度（6.5％），但模式I I IFT（-21％）的降低。结果有助于确定层间浸润，层间穿越和形成碳纤维桥梁的作用，以与交通道的层间增强。
The introduction of nanostructured interlayers is one of the most promising strategies for interlaminar reinforcement in structural composites. In this work, we study the failure mechanism and interlayer microstructure of aerospace-grade structural composites reinforced with thin veils of carbon nanotube produced using an industrialised spinning process. Samples of unidirectional carbon fibre/epoxy matrix composites interleaved with different composition CNT veils were prepared using hot press method and tested for interlaminar fracture toughness (IFT), measured in Mode-I (opening) and Mode-II (in-plane shear), and for interlaminar shear strength (ILSS), evaluated by the short beam shear (SBS) test. The crack propagation mode could be directly determined through fractography analysis by electron microscopy and resin/CNT spatial discrimination by Raman spectroscopy, showing a clear correlation between interlaminar reinforcement and the balance between cohesive/adhesive failure mode at the interlayer region. Composites with full resin infiltration of the CNT veils give a large increase of Mode II IFT (88%) to 1500 J/m2 and a slight enhancement of apparent interlaminar shear strength (6.5%), but a decrease of Mode I IFT (-21%). The results help establish the role of interlayer infiltration, interlaminar crossings and formation of a carbon fibre bridgings, for interlaminar reinforcement with interleaves.
