芳纶-石墨烯增强复合材料弹性性能模拟
Simulation of the Elastic Properties of Reinforced Kevlar-Graphene Composites
摘要：
研究了具有石墨烯薄外层的Kevlar纱线形式的单向纤维复合材料的压缩强度并建模。这种纤维结构可以通过使用凯夫拉纱线和石墨烯片之间的强化学键来制造。石墨烯和Kevlar的化学官能化可以通过修饰适当的表面结合的官能团（例如，羧酸）基团。在这份报告中，我们研究了弹性响应的单向面内施加的负载沿直径的负载峰值。2D线性弹性模型预测，当石墨烯外层半径为凯夫拉纱线半径的约4%时，发生显著的强化。Kevlar的高分子链通过氢键连接成局部平面结构，横向强度远小于纵向强度。这表明，引入通过强化学键连接到聚合物链的石墨烯外包层可以显著增强Kevlar纤维的横向变形。
英文摘要：
The compressive strength of unidirectional fiber composites in the form of Kevlar yarn with a thin outer layer of graphene was investigated and modeled. Such fiber structure may be fabricated by using a strong chemical bond between Kevlar yarn and graphene sheets. Chemical functionalization of graphene and Kevlar may achieved by modification of appropriate surface-bound functional (e.g., carboxylic acid) groups on their surfaces. In this report we studied elastic response to unidirectional in-plane applied load with load peaks along the diameter. The 2D linear elasticity model predicts that significant strengthening occurs when graphene outer layer radius is about 4 % of kevlar yarn radius. The polymer chains of Kevlar are linked into locally planar structure by hydrogen bonds across the chains, with transversal strength considerably weaker than longitudinal one. This suggests that introducing outer enveloping layer of graphene, linked to polymer chains by strong chemical bonds may significantly strengthen Kevlar fiber with respect to transversal deformations.
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