摘要
为评价不同混杂结构复合材料冲击阻抗的混杂效应,通过引入芳纶纤维增强体制备了层间混杂(IE)、夹芯混杂(SA)、非对称混杂(US)和层内混杂(IA)的碳-芳纶二维编织复合材料,并通过落锤冲击实验研究了混杂结构对其冲击载荷、冲击吸收能量、损伤形貌等性能的影响.实验结果表明:层内混杂(IA)试样具有最高的峰值载荷(4.28 k N),比非混杂结构层板高37.2%;其他混杂结构试样中,峰值载荷均低于非混杂结构层板,层板IE的韧性指数DI值比层板SA的高31.5%,说明层间混杂结构表现出比夹芯混杂结构优良的冲击韧性;但IA的弹性应变能(5.964 J)最大,其他试样弹性应变能(几乎为0)远小于试样IA,表明试样IA在冲击过程中产生了较大的弹性变形,表现出优良的韧性性能.通过超声扫描成像系统观察并评价层板内部冲击损伤及失效机理可知:碳纤维层板产生了较严重的内部损伤,试样SA和试样US侧面产生了分层现象;试样IE的C扫描图像显示试样产生了程度较轻的内部损伤,但和试样IA相比,其蓝色区域分布范围较大;IA试样冲击内部损伤面积较小,说明碳纤维和芳纶纤维相互交织排列的层内混杂结构,表现出较强的塑性变形能力和良好的抗冲击性能.
Four different types of carbon-aramid hybrid 2 D braided composites were produced and tested, such as interply hybrid（IE）, sandwich-like hybrid（SA）, unsymmetric hybrid（US） and intraply hybrid（IA）, to evaluate the hybridization effects of impact resistence of carbon/epoxy composites by introducing aramid fiber reinforcements.The effects of the hybrid structure on the impact properties such as the Pm（peak load）, the ductility index（DI）and internal damage were discussed. It is concluded that the Pm of intraply hybrid are the highest（4.28 k N）,which is 37.2% higher than those of hybrid structure. Among other hybrid structure specimens, the peak load is lower than those of hybrid structure. The DI value of IE is 31.5% higher than that of SA, indicating that the interply hybrid shows better impact-toughness than the sandwich-like hybrid. However, the elastic strain energy of IA（5.964 J） is the largest and other specimens is much smaller than that of IA（almost 0）. It is shown that IA shows larger elastic deformation and excellent ductile properties than others. The internal damage and failure mechanisms were analyzed from the C-scan imaging. The carbon fiber specimens produce severe internal damage. There are severe delamination cracks on the sides of sandwich-like hybrid specimens and unsymmetric hybrid specimens. The C-scan imaging of the interply hybrid shows that there are weaker internal damage, but the blue region is larger than that of intraply hybrid. The internal damage area of intraply hybrid is smaller. It is concluded that the intraply hybrid shows strong plastic deformation ability and good impact resistance.
作者
孙颖
田书全
唐梦云
陈冬
SUN Ying1,2，TIAN Shu-quan1,2，TANG Meng-yun1,2，CHEN Dong1,2(1. School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China; 2. Key LaboratoPy of Advanced Textile Composite Materials of Ministry of Education, Tianjin Polytechnic Unirersity, Tianjin 300387, Chin)
出处
《天津工业大学学报》
CAS
北大核心
2018年第3期1-6,共6页
Journal of Tiangong University
基金
国家自然科学基金资助项目(11102133)
天津市科技支撑计划重点项目(15ZCZDGX00340)
关键词
碳纤维
芳纶纤维
二维编织
复合材料
混杂结构
低速冲击
carbon fiber
aramid fiber
2D braided
composites
hybrid structure
low velocity impact
