用于航空复合材料的自动铺丝干纤维层间粘结性能  

Study on the interlayer bonding property of dry fiber tows used in automated fiber placement for aerospace composites

作　　者：耿奕 宁博 陈吉平 宋清华 刘卫平 袁宇慧 杨洋 GENG Yi;NING Bo;CHEN Jiping;SONG Qinghua;LIU Weiping;YUAN Yuhui;YANG Yang(Shanghai Aircraft Manufacturing CO.LTD.,Shanghai 201324,China)

机构地区：[1]上海飞机制造有限公司,上海201324

出　　处：《复合材料学报》2022年第9期4441-4458,共18页Acta Materiae Compositae Sinica

基　　金：上海市科委科技创新行动计划高新技术领域项目(20511107300);上海市扬帆计划项目(19YF1417000);民用航空复合材料东华大学协同创新中心、上海市高性能纤维复合材料协同创新中心(省部共建)开放课题项目(X12812101/021)。

摘　　要：为了保证干纤维预成型体的层间良好贴覆,分别对一种成熟应用于航空级主承力构件的干纤维自动铺放材料和一种研发级材料进行层间粘结性研究。采用热压工艺模拟自动铺丝过程,通过T型剥离和多种表征方法测试干纤维层间粘结力、表面性能和定型剂扩展,比较两种干纤维的层间粘结力,并研究其层间粘结机制。研究发现:成熟干纤维的层间粘结力在一定范围内远大于研发干纤维,二者均显著受到层压温度、层压时间及协同作用的影响,但最显著的影响因素不同;干纤维层间粘结机制与干纤维表面性能、定型剂性能及受热扩展过程有关,推测成熟干纤维的较高层间粘结力与定型剂的交联有关;此外,通过自动铺放工艺的验证,在一定层压时间范围内,采用热压工艺代替自动铺丝进行干纤维层间粘结性的评价具有良好可靠性;最后,干纤维表面涂覆热塑性增韧材料后,层间粘结力大幅下降。通过对材料和工艺的研究,本文为干纤维自动铺丝工艺的优化提供了数据及理论支持。In order to guarantee the good adhesion between layers of dry fiber preform, the interlayer bonding properties of two kinds of automatic fiber placement dry fiber tows were investigated, one has been maturely used in aerospace primary force-taking structure and the other one is under development. Dry fiber laminate samples were prepared by hot pressing to simulate the automatic fiber placement. The interlayer bonding property, surface properties and binder extension of dry fibers were measured by the T-type peeling test and various characterization methods. The interlayer bonding strength of the two kinds of dry fibers was compared and the interlayer bonding mechanism was studied. The results show that the interlayer bonding strength of mature dry fibers is much greater than that of developing dry fibers in a certain temperature range. Both of them are significantly affected by lamination temperature, lamination time and the synergistic effect, but the most significant factors of the two materials are different. The interlayer bonding mechanism of dry fibers is related to surface properties of dry fibers, properties of binder and the binder extension at elevated temperature. It is speculated that the interlayer bonding force of mature dry fibers is related to the crosslinking of the binder. In addition, through the verification of the automatic laying process, the hot pressing process has good reliability in the evaluation of interlayer bonding between the dry fiber layers within a certain lamination time comparing to the automatic fiber placement. Finally, when the dry fiber surface is coated with the thermoplastic toughening material, the adhesion between layers decreases significantly.Through the study of materials and technology, this paper provides data and theoretical support for the optimization of automatic fiber placement process.

关 键 词：自动铺丝 干纤维 预成型体 层间粘结性能 定型剂 

分 类 号：TB332[一般工业技术—材料科学与工程]