摘要
为修补航空复合材料使用过程中出现的微裂纹损伤,在环氧树脂基复合材料内部填充单组分微胶囊(壁材为脲醛树脂、芯材为苯甲醇稀释的环氧树脂)。当复合材料内部受损时,微胶囊破裂,流出的修复剂与外部注射的固化剂二乙烯三胺接触,两者在常温下发生交联固化反应,达到修补微裂纹的目的。研究了A、B、C、D 4种不同粒径环氧树脂微胶囊及其填充到复合材料中所占质量分数对材料力学性能及其自修复性能的影响。通过电子万能试验机研究拉伸、弯曲和梯形双悬臂梁(TDCB)试样的力学性能。结果表明:微胶囊填充使复合材料的力学性能下降,但由4种微胶囊填充得到的复合材料的修复率均在65%以上,其中A、B类微胶囊的填充对复合材料力学性能的影响较低,当A、B类微胶囊填充质量分数为5%、7%时,修复率最大,分别为90.1%、92.8%。
In order to repair the defect of microcrack that is occurred during the use of aeronautical composite material,the one-component microcapsule(the wall material is urea-formaldehyde resin,and the core material is epoxy resin diluted by benzyl alcohol)may be filled in the composite material.When the composite material is damaged,the filled microcapsules are ruptured.The over-flowing core material and the curing agent-diethylenetriamine(via external injection)are mixed by cross-linking reaction at room temperature to repair the microcrack.The effects of four different sizes of epoxy resin microcapsules(A,B,C and D)filled in composites and their mass fractions on the mechanical properties and self-healing properties are investigated.The specimens for tensile,bending,and tapered double cantilever beam(TDCB)fracture testing are measured by the electronic universal testing machine.The results indicate that the mechanical properties of the composites are decreased because of the filling of microcapsules,but the repairing ratios of the composites are all more than 65%.The effects of A and B filled microcapsules on the mechanical properties of composites are lower.The maximum repairing ratios are 90.1%and 92.8%respectively when the mass fractions of A and B filled microcapsules are 5%and 7%.
作者
肖春平
万里鹰
吴嘉栋
连爱珍
谢小林
XIAO Chunping;WAN Liying;WU Jiadong;LIAN Aizhen;XIE Xiaolin(School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,Jiangxi,China;Shanghai Aerospace Equipment Manufacturing General Factory,Shanghai 200245,China)
出处
《上海航天》
CSCD
2018年第1期124-131,共8页
Aerospace Shanghai
基金
国家自然科学基金(51463016)
江西省重点研发计划(CK20161140)
江西省教育厅科学技术项目(GJJ160689)
上海航天科技创新基金(SAST2016053)
关键词
复合材料
力学性能
微裂纹
环氧树脂微胶囊
自修复性能
梯形双悬臂梁试样
固化剂
修复率
composite material
mechanical property
microcrack
epoxy resin microcapsules
self-healing property
tapered double cantilever beam
curing agent
repairing ratio