Delivering interlaminar reinforcement in composites through electrospun nanofibres

IF 1.8 Q3 ENGINEERING, MANUFACTURING Advanced Manufacturing: Polymer & Composites Science Pub Date : 2019-09-19 DOI:10.1080/20550340.2019.1665226

T. Pozegic, S. King, M. Fotouhi, V. Stolojan, S. Silva, I. Hamerton

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引用次数: 8

Abstract

Abstract Electrospun nonwoven veils comprising thermoplastic fibres (average diameter 400–600 nm) based on polysulfone (PSU), polyamide (PA-6,6), and polyetherimide (PEI) have been fabricated and used as interlaminar reinforcements in carbon fibre composites containing a commercial epoxy resin (8552/IM7). Samples were tested for their interlaminar properties and improvements were observed in the initial mode I interlaminar toughness of 30% (PA-6,6), 36% (PEI), and 44% (PSU), while improvements of 7% (PSU) and 8% (PEI) were observed in the propagation of the mode I interlaminar toughness. A reduction of 11% was observed for the propagation of the mode I interlaminar toughness for PA-6,6. Post-testing analysis of the cross-section and the fracture surface revealed that the crack front avoids the reinforcement significantly for PA-6,6. For mode II, however, this failure mechanism leads to improvements of 30% in interlaminar toughness for the PA-6,6, whereas the other reinforcements display negligible (PEI) and 31% reduction (PSU) interlaminar toughness. Graphical Abstract

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通过静电纺纳米纤维在复合材料中提供层间增强

摘要以聚砜(PSU)、聚酰胺(pa -6,6)和聚醚酰亚胺(PEI)为基材，制备了热塑性纤维(平均直径400 - 600nm)的电纺丝非织造纱，并将其用作含工业环氧树脂(8552/IM7)的碳纤维复合材料的层间增强。对样品的层间性能进行了测试，发现初始I型层间韧性提高了30% (pa -6,6)， 36% (PEI)和44% (PSU)，而在I型层间韧性的扩展中，提高了7% (PSU)和8% (PEI)。观察到pa -6,6的I型层间韧性的传播降低了11%。试验后断面和断口分析表明，裂纹前缘对pa -6,6的加固作用有明显的回避作用。然而，对于模式II，这种破坏机制导致pa -6,6的层间韧性提高了30%，而其他增强材料的层间韧性可以忽略不计(PEI)，降低了31% (PSU)。图形抽象

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