基于细观结构的径向轴纱三维五向圆形编织复合材料的刚度预测  

Stiffness prediction of 3D five-directional circular braided composites with radial yarns based on microstructure

作　　者：陈波 张昇雨 杨兴林 张俊苗 CHEN Bo;ZHANG Shengyu;YANG Xinglin;ZHANG Junmiao(School of Energy and Power,Jiangsu University of Science and Technology,Zhenjiang 212100,China)

机构地区：[1]江苏科技大学能源与动力学院,江苏镇江212100

出　　处：《现代纺织技术》2024年第2期83-95,共13页Advanced Textile Technology

基　　金：江苏科技大学博士科研启动基金项目(1142931905)。

摘　　要：在细观尺度下,根据1种径向轴纱的三维五向圆形编织纱线的空间结构,考虑纱线相互挤压后的截面形状,通过引入圆形单胞的周期性边界条件,建立了包含上、下表面子单胞以及内部单胞的三维五向圆形编织复合材料单胞模型。基于该单胞模型,采用刚度体积平均法,建立了三维五向圆形编织复合材料的刚度预测模型,对花节长度分别为0.6、0.7、0.8 mm的三维五向圆形编织复合材料进行刚度预测,并与复合材料力学刚度理论计算方法所得结果进行了对比。结果表明:3种花节的纤维体积分数分别为24.94%、23.33%、22.04%,纤维体积分数、编织角与花节长度呈负相关;单胞模型的弹性模量预测结果分别为16.42、15.63、14.83 GPa,理论计算结果分别为16.96、16.25、15.34 GPa,纵向刚度与花节长度负相关;单胞几何模型考虑了复合材料成型后纱线的相互挤压,使得单胞模型中的纤维体积含量略小于理论计算方法,造成理论计算结果略大于单胞预测结果。研究结果能够有效提高三维五向圆形编织复合材料刚度预测精度,扩展了细观单胞法的应用领域,为今后三维五向圆形编织复合材料的应用提供必要的理论依据。As one of the main load-bearing components,3D five-directional circular braided composites have great advantages in mechanical properties,economy and structure,and have been gradually applied in aerospace,maritime transportation and other fields.They are a typical 3D multi-directional circular braided composite material.But due to the high complexity of the internal structure,the research on the mechanical properties of the material is not sufficient,the theoretical prediction is difficult,and the relevant research literature is seriously insufficient,which greatly limits the application and development of 3D five-directional circular braided composites.Therefore,it is of great significance to improve the theoretical research of mechanical properties by studying the mechanical property prediction and damage evolution law of 3D five-directional circular braided composites.To effectively predict the mechanical properties of 3D five-directional circular braided composites,the topological structure of 3D five-directional circular braided composites with radial yarns was obtained based on the spatial structure of 3D five-directional circular braided yarns with radial yarns at the meso-scale,considering the cross-sectional shape of the yarns after squeezing each other.The periodic law of circular unit cell braiding was introduced,and the unit cell structure characteristics of 3D five-directional circular braided composites with radial yarns were obtained.The unit cell was divided into three seed cells including“the upper surface unit cell,the internal unit cell and the lower surface unit cell”.The unit cell geometric model and mesh model of 3D five-directional circular braided composites including upper and lower surface sub-unit cells and internal unit cells were established by ANSYS APDL.The appropriate periodic boundary conditions were applied to the geometric model.Starting from the unit cell model,based on the stiffness volume average method,the tensile stiffness prediction of 3D five-directional circular brai

关 键 词：三维五向编织 圆形编织 三单胞法 刚度体积平均法 复合材料 刚度预测 

分 类 号：TS101.2[轻工技术与工程—纺织工程]