Fracture behavior and crack sensing capability of bonded carbon fiber composite joints with carbon nanotube-based polymer adhesive layer under Mode I loading
Fracture behavior and crack sensing capability of bonded carbon fiber composite joints with carbon nanotube-based polymer adhesive layer under Mode I loading
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DOI：
10.1016/j.compscitech.2017.04.014
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发表时间：
2017-07-07
影响因子：
9.1
通讯作者：
Narita, Fumio
中科院分区：
文献类型：
--
作者：
Takeda, Tomo;Narita, Fumio
本文研究了具有碳纳米管（CNT）基聚合物粘合层的粘合碳纤维增强聚合物（CFRP）复合材料接头的 I 型断裂行为和裂纹监测。使用编织碳/环氧树脂复合基材和基于碳纳米管的环氧树脂粘合剂制造粘合接头。采用双悬臂梁 (DCB) 粘合接头样本进行 I 型断裂试验，检查裂纹扩展开始时的临界能量释放速率（即断裂韧性）对粘合剂层中纳米管含量和粘合剂层厚度的依赖性。在测试期间监测粘合接头样本的电阻。还采用基于CNT基聚合物导电机制的分析模型来描述由于粘合接头样品中裂纹扩展而引起的电阻变化，并且预测结果与测量结果之间具有良好的相关性。发现电阻变化导致基于电阻测量的裂纹长度的定量评估。结果表明，具有碳纳米管基聚合物粘合层的粘合 CFRP 复合材料接头具有改善的断裂性能和裂纹传感能力。 (C) 2017 Elsevier Ltd. 保留所有权利。
This paper presents a study on the Mode I fracture behavior and crack monitoring of bonded carbon fiber reinforced polymer (CFRP) composite joints with carbon nanotube (CNT)-based polymer adhesive layer. Bonded joints were fabricated using woven carbon/epoxy composite substrates and CNT-based epoxy adhesives. Mode I fracture tests were carried out with double cantilever beam (DCB) bonded joint specimens, and the dependence of the critical energy release rate at the onset of crack growth, i.e., fracture toughness, on the nanotube content in the adhesive layer and the adhesive layer thickness was examined. The electrical resistance of the bonded joint specimens was monitored during the tests. An analytical model based on the electrical conduction mechanism of CNT-based polymers was also employed to describe the electrical resistance change due to crack propagation in the bonded joint specimens, and a good correlation was obtained between the predicted and measured results. The electrical resistance change is found to result in quantitative assessment of crack length based on resistance measurement. It is demonstrated that the bonded CFRP composite joints with CNT-based polymer adhesive layer have improved fracture properties together with crack sensing capability. (C) 2017 Elsevier Ltd. All rights reserved.