复合材料T型桁条的VARTM成型工艺研究  

Study on VARTM Forming Process of Composite T-shaped Stringer

作　　者：申儒林[1] 刘和华 邹湘伏[1] 龚艳玲[1] SHEN Rulin;LIU Hehua;ZOU Xiangfu;GONG Yanling(College of Mechanical and Electrical Engineering,Central South University,Changsha 410083)

机构地区：[1]中南大学机电工程学院,长沙410083

出　　处：《宇航材料工艺》2024年第5期62-69,共8页Aerospace Materials & Technology

基　　金：湖南省科技创新重大项目“通航用国产复合材料工艺与验证技术研究”(2021GK1024)。

摘　　要：采用真空辅助树脂转移成型(VARTM)方法制备机翼T型桁条具有很高的性价比,但是桁条节点处截面特征不利于成型过程树脂的均衡流动。本文针对T型桁条三角区树脂富集而边缘区浸润不足的问题,采用模具拐角三角区纤维填充方法,优化VARTM工艺参数,提高桁条的力学性能。研究了工艺方案对T型桁条各部位厚度均匀性的影响;采用光学显微镜观测桁条微观形貌;采用灼烧法定量分析孔隙率和纤维体积分数;采用万能材料试验机测试桁条力学性能。结果表明,本文纤维填充VARTM工艺成型的T型桁条具备良好的厚度均匀性、较高的纤维体积分数和较低的孔隙率以及良好力学性能,桁条的抗弯能力提高了15.72%,孔隙率低于1%(0.9%)。Vacuum assisted resin transfer molding(VARTM)was a cost-effective method for fabricating wing T-shaped stringer,but the cross-section characteristics of the stringer were not conducive to the balanced resin flow during the molding process.Aiming at the problem of resin enrichment in triangle area of T-shaped stringer but insufficient wetting in edge area,the fiber filling method of corner triangle area of mold was adopted in this paper to optimize VARTM process parameters and improve the mechanical properties of T-shaped stringer.The influence of process scheme on the thickness uniformity of each part of stringer was studied.Optical microscope was used to observe the microstructure of the stringer.Moreover,the void content and fiber volume fractions were quantitatively analyzed by burning method.Besides,the mechanical properties of the stringer were tested by universal material testing machine.The results show that the T-shaped stringer formed by VARTM process has good thickness uniformity,high fiber volume fractions,low void content and good mechanical properties,the bending resistance of the stringer is increased by 15.72%and the void content is less than 1%(0.9%).

关 键 词：VARTM T型桁条 复合材料 玻璃纤维 孔隙率 纤维体积分数 

分 类 号：TB332[一般工业技术—材料科学与工程]