机织角联锁变密度复合材料的面外压缩力学特性  

Out-of-plane compression properties of angle interlock compositeswith variable densities

作　　者：王遵钦 刘东炎 王晓旭[1] 张典堂[1] WANG Zunqin;LIU Dongyan;WANG Xiaoxu;ZHANG Diantang(Key Laboratory of Eco-Textiles(Jiangnan University),Ministry of Education,Wuxi,Jiangsu 214122,China)

机构地区：[1]生态纺织教育部重点实验室(江南大学),江苏无锡214122

出　　处：《纺织学报》2024年第7期63-71,共9页Journal of Textile Research

基　　金：国家自然科学基金项目(11702115,12072131);江苏省优秀青年基金项目(BK20211583);173重点项目(FW-KY-104-2023-015)。

摘　　要：为研究变密度结构设计对三维机织角联锁复合材料面外力学性能的影响,设计制备了三维机织角联锁不变密度复合材料、三维机织角联锁经纱变密度复合材料和三维机织角联锁纬纱变密度复合材料。结合扫描电子显微镜、数字图像相关技术和X射线计算机断层扫描等检测技术,对角联锁变密度复合材料的面外压缩力学行为、内部损伤量化和渐进损伤等进行了测试与表征。研究结果表明:上疏下密角联锁纬纱变密度复合材料展现出优异的压缩性能,其压缩比强度比不变密度复合材料高3.40%;同时,上疏下密角联锁纬纱变密度复合材料损伤体积仅为11.64 mm 3,远低于不变密度复合材料的26.90 mm 3。进一步分析得到,不变密度复合材料压缩破坏以剪切失效为主,而上疏下密角联锁纬纱变密度复合材料则为基体开裂。Objective Angle interlock composites have been widely used in defense engineering fields because of their excellent interlayer delamination performance,strong designability,near-clean forming and other characteristics,and can still maintain good structural integrity after post-processing.In recent years,major equipment components in the air,sky and sea have increasingly high requirements for lightweight,and,therefore,it is urgent to carry out innovative structural design and application of angle interlock composites to effectively reduce structural parameters and improve load-bearing efficiency.Among them,angle interlock composite with variable densities provides an effective means to realize the"light-strength coordination"of components.Method In order to explore the influence of warp density or weft density on compression mechanical properties of angle interlock carbon/epoxy composites,the T700-12K carbon fiber was selected.Then three-dimensional(3-D)woven angle interlock composites with variable warp density or weft density and constant warp and weft density were prepared by resin transfer molding(RTM).On this basis,combined with digital image correlation technology(DIC),the out-of-plane compression test was carried out,and the damage morphology and damage distribution inside the samples were analyzed by scanning electron microscopy and computed tomography(Micro-CT).Finally,the progressive damage evolution process and failure mechanism of out-of-plane compression were sorted out.Results All samples showed yield failure characteristics.In addition,by comparing with the compression specific strength and compression specific modulus of 5 types of composites,it was found that the compression specific modulus of samples with variable densities was significantly improved.Among them,the compressive specific strength of the warp yarn is dense at the top and sparse at the bottom composites(BJ-MS)sample was 4.36%higher than that of the warp yarn is sparse on the top and dense on the BJ-SM sample,and the compressive spec

关 键 词：角联锁织物 碳/环氧复合材料 变密度结构设计 面外压缩 计算机断层扫描技术 损伤机制 

分 类 号：TB332[一般工业技术—材料科学与工程]