Energy-absorption enhancement in carbon-fiber aluminum-foam sandwich structures from short aramid-fiber interfacial reinforcement
Energy-absorption enhancement in carbon-fiber aluminum-foam sandwich structures from short aramid-fiber interfacial reinforcement
复制标题
短芳纶纤维界面增强碳纤维泡沫铝夹层结构的能量吸收
DOI：
10.1016/j.compscitech.2013.01.016
复制
发表时间：
2013-03-22
影响因子：
9.1
通讯作者：
Chen, Haoran
中科院分区：
文献类型：
--
作者：
Sun, Zhi;Hu, Xiaozhi;Chen, Haoran
在三点弯曲(3PB)条件下，测量了由泡沫铝芯材和两层碳纤维/环氧复合材料面片组成的夹层梁的能量吸收和峰值载荷。为了改善泡沫铝芯材和碳纤维面片之间的界面结合，从而提高夹层结构的能量吸收，在夹层制作过程中，在面芯界面处插入不同长度和密度的短芳纶纤维。在3PB的测试条件下，峰值负载提高了38%，能量吸收改善了近80%。芳纶纤维占夹层结构总重量的百分比不到1%，说明芳纶短纤维交织在成本和结构性能上都是有效的。利用扫描电子显微镜和界面裂纹桥联模型，讨论和分析了芳纶短纤维的界面分布特征和吸能增韧增强机理。皇冠版权所有(C)2013由爱思唯尔有限公司出版。保留所有权利。
Energy absorptions and peak loads of sandwich beams, consisting of an aluminum foam core covered with two carbon-fiber/epoxy composite face sheets, were measured under a three-point-bending (3 PB) condition. To improve interfacial bonding between the aluminum-foam core and carbon-fiber face sheets and thus the energy absorption of the sandwich structures, short aramid fibers of different lengths and densities were inserted at the face core interface during the sandwich fabrication process. Up to 38% improvement in the peak load, and close to 80% improvement in the energy absorption were achieved as measured under the 3 PB condition. The weight percentage of aramid fibers was less than 1% of the total weight of the sandwich structure, which shows the short aramid fiber interleave is effective in terms of both cost and structural performance. The interfacial distribution characteristics of the short aramid fibers and underlying toughening and strengthening mechanisms for energy absorption were discussed and analyzed, using scanning electron microscopy and through modeling of interfacial crack-bridging. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.