Effects of fiber length on mechanical properties and fracture behavior of short carbon fiber reinforced geopolymer matrix composites
Effects of fiber length on mechanical properties and fracture behavior of short carbon fiber reinforced geopolymer matrix composites
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DOI：
10.1016/j.msea.2008.06.040
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发表时间：
2008-12-15
期刊：
影响因子：
6.4
通讯作者：
Liang, Defu
中科院分区：
文献类型：
--
作者：
Lin, Tiesong;Jia, Dechang;Liang, Defu
以2、7和12 mm短纤维为原料，研制了一种片状碳纤维预制体，并用于增强地质聚合物。通过三点弯曲试验、光学显微镜和扫描电镜研究了复合材料的力学性能、断裂行为、微观结构和增韧机理。结果表明，短碳纤维在地聚合物基体中分散均匀。C-f/地质聚合物复合材料的力学性能明显提高，并表现出明显的非灾难性破坏行为。7 mill长碳纤维增强的复合材料具有最大的弯曲强度和断裂功，分别比地质聚合物基体高出近5倍和2个数量级以上。其主要的强韧化机制是基于纤维/基体弱界面以及片状碳纤维预制体的明显的纤维桥接和拔出效应。(C)2008 Elsevier B. V.保留所有权利。
A kind of sheet-like carbon fiber preform was developed using short fibers (2, 7 and 12 mm, respectively) as starting materials and used to strengthen a geopolymer. Mechanical properties, fracture behavior, microstructure and toughening mechanisms of the as-prepared composites were investigated by three-point bending test, optical microscope and scanning electron microscopy. The results show that the short carbon fibers disperse uniformly in geopolymer matrix. The C-f/geopolymer composites exhibit apparently improved mechanical properties and an obvious noncatastrophic failure behavior. The composite reinforced by the carbon fibers of 7 mill in length shows a maximum flexural strength as well as the highest work of facture, which are nearly 5 times and more than 2 orders higher than that of the geopolymer matrix, respectively. The predominant strengthening and toughening mechanisms are attributed to the apparent fiber bridging and pulling-out effect based on the weak fiber/matrix interface as well as the sheet-like carbon fiber preform. (C) 2008 Elsevier B.V. All rights reserved.