三维角联锁机织复合材料的制备及其弯曲压缩失效机制  

Preparation and bending compression failure mechanism of three-dimensional angle interlock woven composites

作　　者：李天宇 沈伟[1,2] 陈立峰 竺铝涛 LI Tianyu;SHEN Wei;CHEN Lifeng;ZHU Lütao(College of Textile Science and Engineering(International Institute of Silk),Zhejiang Sci-Tech University,Hangzhou,Zhejiang 310018,China;Shaoxing Baojing Composite Material Co.,Ltd.,Shaoxing,Zhejiang 312000,China;Zhejiang Sci-Tech University Tongxiang Research Institute,Jiaxing,Zhejiang 314599,China)

机构地区：[1]浙江理工大学纺织科学与工程学院(国际丝绸学院),浙江杭州310018 [2]绍兴宝旌复合材料有限公司,浙江绍兴312000 [3]浙江理工大学桐乡研究院有限公司,浙江嘉兴314599

出　　处：《纺织学报》2024年第8期183-189,共7页Journal of Textile Research

基　　金：浙江省基础公益研究计划项目(LGG21E050025);浙江省“尖兵”研发攻关计划项目(2023C01097);浙江理工大学桐乡研究院有限公司开放基金类项目(TYY202302)。

摘　　要：为掌握三维纺织结构复合材料在准静态下的失效机制,以碳纤维角联锁预制体为增强体,环氧树脂为基体,采用树脂传递模塑成型工艺制备三维角联锁机织复合材料,并对试样进行匀速载荷下的三点弯曲和压缩试验。采用X射线计算机断层扫描技术观测材料内部结构的损伤情况,并分析材料的失效机制。结果表明:三维角联锁机织复合材料的弯曲强度达到136.43 MPa,弹性模量接近20 GPa,材料的抗弯曲性能优异;基体开裂、下表面纤维断裂和分层是材料的主要弯曲失效模式;材料沿厚度方向的压缩应力达到266.17 MPa,具有良好的抗压缩性能;当承受压缩载荷时,材料在厚度方向上的主要破坏机制表现为剪切破坏。Objective Three-dimensional(3-D)woven fabric is an fabric structure wherein the upper and lower layers of fabric are interconnected using warp or weft yarns to form an angle interlock structure.Due to their exceptional mechanical properties,3-D woven composites have gained increasingly popularity in aerospace and military applications.While most research has focused on the failure mechanism of angle interlock woven composite(AIWC)under dynamic load,it is crucial to also consider the various loads that AIWCs endure in practical engineering applications,partications in quasi-static environments.Although the quasi-static load is implicit,the damage and failure resulting from such load cansignificantly impact materials safety,underscoring the importance of studying the mechanical properties of AIWCs in quasi-static environments.Method In this study,3-D woven composites were prepared using the vacuum assisted resin transfer molding(VARTM)technique.Subsequently,their bending and compression properties were investigated through three-point bending and compression experiments.X-ray computed tomography(XR-CT)technology was employed to observe microstructural damage profiles and analyze the failure mechanism of the material.Results In the three-point bending test,the maximum load on the 3-D woven composites reached 1108.3 N,the bending strength reached 136.43 MPa,and the bending modulus was close to 20 GPa.The primary failure modes of the material included resin compression fracture on the upper and lower surfaces,fiber layer delamination,and warp yarn tension fracture on the lower surface.In terms of compression resistance in the thickness direction,the 3-D woven composites exhibited favorable pefformance.Under compression load,the material experienced significant shear failure along the 45°direction in the thickness,accompanied by resin fragmentation and wavy delamination in both longitudinal and latitudinal directions.Additionally,compression expansion was observed in the latitudinal section.These phenomena were attrib

关 键 词：角联锁结构 复合材料 角联锁机织复合材料 碳纤维 弯曲性能 压缩性能 失效机制 

分 类 号：TB332[一般工业技术—材料科学与工程]