摘要
使用浓H_2SO_4/浓HNO_3的混酸体系对碳纤维(CF)的表面进行处理得到氧化碳纤维(OCF)。采用超声分散和模具浇注成型法制备氧化碳纤维/空心玻璃微珠(HGMs)/环氧树脂固体浮力材料,研究了材料的密度、抗压强度、吸水率和断面形貌。使用ABAQUS数值模拟软件,建立了碳纤维增强固体浮力材料的模型,研究了碳纤维对材料应力分布的影响。结果表明,碳纤维经过氧化后,表面形成了羟基和羧基等基团,提高了自身与环氧树脂的界面结合状态。随着氧化碳纤维含量的增加,复合材料的占空比逐渐提高,但密度变化不大,而其抗压强度呈现先升高后降低的趋势。当碳纤维含量为5%(质量分数)时,抗压强度达41MPa,提高约13.8%。固体浮力材料吸水率随碳纤维含量增加而提高,但所有试样的吸水率均小于2%。复合材料模型受压后的应力云图表明,碳纤维能够有效代替固体浮力材料基体承载很大一部分载荷,空心玻璃微珠球壳所受应力降低,减少了空心玻璃微珠破碎和裂纹源的产生,从而对固体浮力材料起到增强作用。
Oxidized carbon fiber（OCF）was obtained by treating the surface of carbon fiber（CF）by the mixed acid system of concentrated H2 SO4 and HNO3.Epoxy resin/OCF/hollow glass microspheres（HGMs）syntactic foams were fabricated by using ultrasonic dispersion and die casting method.The density,compressive strength,water absorption and fractured surface morphology of syntactic foam were studied.The model of carbon fiber reinforced syntactic foam was established by using the ABAQUS numerical simulation software,and the effect of carbon fiber on the stress distribution in syntactic foam was studied.The results show that the hydroxyl and carboxyl groups were formed on the surface of carbon fibers after the oxidation of carbon fibers,and the adhesion of carbon fibers to epoxy resin was improved.With the increase of OCF content,the duty ratio increased but the density of syntactic foams had little change.Compressive strength of syntactic foam increased first and then decreased.When the content of OCF was 5%,the compressive strength was the highest,which was 41 MPa,improved by about 13.8%.The water absorption also increased with the increase of carbon fiber.The water absorption of all the samples was less than 2%.By analyzing the stress nephogram after compression of the model,it shows that carbon fiber can effectively bear a large part of stress in syntactic foam.The stress of HGMs decreases,which reduces the broken of HGMs and the generation of crack source,thus enhancing syntactic foam.
作者
王耀声
亚斌
周秉文
孟令刚
Devesh Misra
张兴国
WANG Yaosheng;YA Bin;ZHOU Bingwen;MENG Linggang;MISRA Devesh;ZHANG Xingguo(Key Laboratory of Solidification Control and Digital Preparation Technology（Liaoning Province）,School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China;Department of Metallurgical and Materials Engineering,University of Texas at El Paso,TX 79968,USA)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2018年第8期8205-8210,共6页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51375071)
中央高校基本科研业务费专项资金资助项目(DUT17RC(3)012)
关键词
碳纤维
环氧树脂
空心玻璃微珠
力学性能
数值模拟
carbon fiber
epoxy resin
hollow glass microspheres
mechanical property
numerical simulation
