碳纤维增强编织复合材料圆管的扭转力学性能及其损伤机制  

Torsional mechanical properties and failure mechanism of braided carbon fiber reinforced composite tubes

作　　者：谷元慧 周红涛[1] 张典堂[2] 刘景艳 王曙东[1] GU Yuanhui;ZHOU Hongtao;ZHANG Diantang;LIU Jingyan;WANG Shudong(Yancheng Polytechnic College, Yancheng, Jiangsu 224005, China;Key Laboratory of Eco-Textiles(Jiangnan University), Ministry of Education, Wuxi, Jiangsu 214122, China)

机构地区：[1]盐城工业职业技术学院,江苏盐城224005 [2]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》2022年第3期95-102,共8页Journal of Textile Research

基　　金：江苏省自然科学基金面上项目(BK20201216);江苏高校青蓝工程项目(苏教师〔2018〕12号,苏教师〔2019〕3号);盐城工业职业技术学院校级课题资助项目(ygy2005)。

摘　　要：为研究编织层数对编织复合材料圆管的扭转力学性能和失效模式的影响,采用二维编织铺层(Over-Braiding)工艺及真空辅助树脂灌注成型工艺分别制备了2、3和4层的碳纤维/树脂编织复合材料圆管。通过搭建扭转试验-非接触全场应变测试平台,研究了3种编织层数的复合材料圆管的扭转力学响应。基于扫描电子显微镜与微计算机断层扫描技术等测试方法,分析了编织复合材料圆管的扭转失效机制。结果表明:编织复合材料圆管在扭转载荷下呈线弹性脆断特征,且形成了贯穿管壁的空间螺旋剪切带损伤区;编织层数的增加利于应力应变的稳定扩散,减少整体结构分层损伤,4层圆管的失效扭矩可达450.00 N·m,分别是3层圆管和2层圆管的1.39和2.20倍;失效模式主要有纤维断裂或劈裂、脱黏、基体开裂或碎裂等,宏观层面的失效模式种类差异不大,但在微观层面,编织层数越少,圆管的纤维失效特征更明显。In order to investigate the effect of layers on the torsional mechanical properties and failure modes of braided composite tubes,the over-braiding process and the vacuum-assisted resin infusion molding process were adopted in preparing 3 types of carbon fiber/resin braided composite tubes with 2,3 and 4 layers.By setting up a non-contact full-field torsion strain test platform,the torsional mechanical responses of the braided composite tubes with different layers were studied.Using the scanning electron microscopy and microcomputer tomography technologies,the torsion failure mechanism of the braided composite tubes was analyzed.The results show that the braided composite tubes exhibit elastic and brittle fracture characteristics under torsional load,and spatial spiral shear band damage zones through the tube wall are formed.The increase in the number of braided layers promotes the stable spread of stress and strain,and reduces delamination damage of the overall structure.The failure torque of the composite tube with 4 braided layers reaches 450.00 N·m,which is 1.39 times and 2.20 times that of tubes with 3 and 2 braided layers,respectively.The failure modes mainly include fiber fracture or splitting,debonding,matrix cracking or chipping.There is little difference in the types of failure modes at the macro scale.But at the micro scale,the less the number of braided layers is associated to,the more obvious the fiber failure in the tubes.

关 键 词：碳纤维增强复合材料 编织复合材料 圆管 扭转性能 编织层数 力学性能 失效机制 

分 类 号：TB332[一般工业技术—材料科学与工程]