T形截面三维编织复合材料细观结构分析及弯曲性能预测  

Micro-structure analysis and bending property prediction of three-dimensional braided composites with T section

作　　者：于陈陈 瞿畅[1] 邓婕[1] 代艾波 张小萍[1] 

机构地区：[1]南通大学机械工程学院,江苏南通226019

出　　处：《纺织学报》2015年第6期42-49,共8页Journal of Textile Research

基　　金：南通市应用研究计划项目(BK2012006)

摘　　要：根据矩形组合截面三维编织复合材料四步法编织原理,分析了T形截面编织物的纱线运动规律;按照载纱器的水平运动规律确定了纱线的空间运动轨迹,并用控制体积法建立T形截面交接区域的特殊细观结构模型。在假设纱线截面为椭圆形等理想状态下,建立了编织工艺参数之间的数学关系。运用弯曲刚度合成法预测出T形截面三维编织复合材料的弯曲性能,用Mat Lab编写了弯曲模量的计算程序。结果表明:弯曲模量随编织角的增大而减小,随纤维体积含量的增加而增大,三维五向T形截面梁的弯曲性能优于三维四向的。最后将预测结果与实验结果进行比较分析,结果证实用弯曲刚度合成法预测T形截面三维编织复合材料的弯曲性能是可靠的。According to the 4-step braiding principle of preforms with complex rectangular cross section, the yarns paths in braided preforms with T section were analyzed. The spatial paths of yarns were speculated in accordance with the movements of carriers. By the volume-control method, the special micro-structure model in the join region of composites with T section was established. Assuming the yarn cross-section is an ellipse and under other ideal conditions, the mathematical relationship between braiding parameters was deduced. The bending modulus was predicted by the MatLab program which was developed based on bending stiffness synthesis method. The results showed that bending modulus decreased with braiding angle increasing and increased with fiber volume increasing, and bending property of T beam of three dimensional five directional braided composites was superior to T beam of three dimensional four directional braided composites. Finally, compared with the experimental results, the validity of bendin~ ~ron^rtv nrPA;,,t,~A h,, ~h;~ ~d~_~l ：~：_~

关 键 词：三维编织 T形截面 细观结构 弯曲性能 

分 类 号：TS181[轻工技术与工程—纺织材料与纺织品设计]