针刺碳/碳编织复合材料的弹性性能  

Elastic properties of needled and braiding C/C composites

作　　者：梅颖猷 孙志军[1] 刘永兵 MEI Yingyou;SUN Zhijun;LIU Yongbing(College of Mechanical Engineering,Donghua University,Shanghai,China)

机构地区：[1]东华大学机械工程学院,上海

出　　处：《东华大学学报（自然科学版）》2024年第4期83-90,共8页Journal of Donghua University(Natural Science)

基　　金：“纺织之光”应用基础研究项目(J202202);国家发改委重大技术装备攻关项目(2102-320905-89-05-514710)。

摘　　要：为研究针刺碳/碳(C/C)编织复合材料的编织结构和针刺密度对整体力学性能的影响,根据针刺C/C编织复合材料的细观结构、组成成分的体积参数和编织角度,提出带有针刺区域和编织结构的平行四边形单胞模型。建立针刺C/C编织复合材料细观结构模型,研究编织角度和针刺密度对整体复合材料弹性性能的影响。结果表明:针刺区域与纤维区域的接触处存在应力集中,纤维周围的基体也出现明显的应力集中现象;编织角对针刺C/C编织复合材料的弹性模量的影响较大。采用GB/T33501—2017标准进行复合材料轴向拉伸试验,发现模型预测的弹性模量与试验数据吻合良好,预测结果的误差为2.27%。研究针刺C/C编织复合材料的细观结构可为后续复合材料细观结构的设计和力学性能的探讨提供依据。Based on the microstructure,volume parameters and braiding angle of needled and braiding C/C composites,a unit cell model with needled areas and braiding structures is proposed,in order to study the effect of braiding structure and needled density on the overall mechanical properties of the composites.A microstructure model of needled and braiding C/C composites was established to study the effects of braiding angle and needled density on the overall elastic properties of the composites.The results indicate that there is stress concentration in the contact area between the acupuncture area and the fibers,as well as in the matrix around the fibers area.The braiding angle had a significant impact on the elastic properties of the needled and braiding C/C composites.The axial tensile test of composites was conducted according to the standard of GB/T 33501—2017,and the predicted elastic modulus of the model was in good agreement with the experimental data,with an error of 2.27% in the predicted results.The study of the microstructure of needled and braiding C/C composites can provide some basis for the design of the microstructure and exploration of mechanical properties of subsequent composites.

关 键 词：复合材料 编织角 针刺密度 弹性性能 单胞模型 应力分析 

分 类 号：TB332[一般工业技术—材料科学与工程]