Rubbery nanofibrous interleaves enhance fracture toughness and damping of CFRP laminates
Rubbery nanofibrous interleaves enhance fracture toughness and damping of CFRP laminates
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DOI：
10.1016/j.matdes.2020.109049
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发表时间：
2020-10-01
影响因子：
8.4
通讯作者：
Giorgini, Loris
中科院分区：
文献类型：
--
作者：
Maccaferri, Emanuele;Mazzocchetti, Laura;Giorgini, Loris
橡胶状静电纺丝纳米纤维代表了一种阻止碳纤维增强聚合物（CFRP）层压板分层和增强阻尼能力的智能方法，这是阻碍其使用的两个最严重的缺点。丁腈橡胶/聚（ε-己内酯）（NBR/PCL）共混物纳米纤维，与20-40-60%wt的未交联的NBR，插入在环氧基CFRP，以评估其对最终复合材料性能的影响。具有橡胶垫的CFRP在模式I中显示出能量释放速率的显著增加，在引发和扩展阶段（分别为+480%和+340%），这归功于NBR/PCL共混物促进脆性环氧树脂的高基体增韧的能力。在模式II中，实现了约30%的最大改善。高阻尼NBR组分的存在拓宽了室温以下的复合材料耗能窗口，增强了CFRP阻尼。用两种不同的环氧树脂得到了类似的结果，并讨论了分层顺序的影响。纳米纤维中的NBR百分比和纳米纤维垫的量可以强烈地影响CFRP的最高工作温度。在层压过程中，纳米纤维可以定位在层间应力由于几何不连续性而主要集中的关键区域中，从而提供了对层压材料进行局部改性的灵活方法。(c)2020年，任作家。由爱思唯尔有限公司出版。这是一篇开放获取的文章，使用CC BY许可证（http：//creativecommons.org/licenses/by/4.0/）。
Rubbery electrospun nanofibers represent a smart way for hindering delamination and enhancing damping capacity in Carbon Fiber Reinforced Polymer (CFRP) laminates, which are two of the most serious drawbacks hampering their use. Nitrile Butadiene Rubber/ Poly(epsilon-caprolactone) (NBR/PCL) blend nanofibers, with 20-40-60%wt of not crosslinked NBR, were interleaved in epoxy-based CFRPs to evaluate their effect on the final composite performance. CFRPs with rubbery mats show a significant increase of the energy release rate in Mode I, both at initiation and propagation stages (+480% and +340%, respectively), thanks to NBR/PCL blend ability to promote high matrix toughening of the fragile epoxy resin. In Mode II a maximum improvement of about 30% was achieved. The presence of highly damping NBR component widens the composite energy dissipation window below room temperature, enhancing the CFRP damping. Similar results were obtained with two different epoxy resins, and the effect of the layering sequence was also discussed. NBR percentage in nanofibers and nanofibrous mats amount may strongly affect the CFRP maximum operating temperature. Nanofibers can be positioned, during lamination, in the critical regions where interlaminar stresses are mostly concentrated due to geometric discontinuities providing a flexible approach to localized modification of laminates. (c) 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).