Z-pin增强复合材料帽型加筋壁板接头拉伸性能  

Tensile performance of composites' hat stiffener reinforced wall joint by Z-pin

作　　者：李吻[1] 李勇[1] 还大军[1] 褚奇奕 陈浩然[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《航空学报》2016年第6期2003-2012,共10页Acta Aeronautica et Astronautica Sinica

基　　金：国家"973"计划(2014CB046501);航空科学基金(2015ZE52049);江苏高校优势学科建设工程资助项目~~

摘　　要：为了提高复合材料帽型加筋壁板结构中筋条与蒙皮界面处的连接强度,引入Z-pin三维增强技术。制备了Zpin增强帽型接头试样,并对其进行拉伸试验,研究Z-pin对帽型接头界面增强机理及不同Z-pin体积分数、直径及加载跨距对筋条与蒙皮界面处连接性能的影响规律。结果表明：Z-pin直径为0.5mm、植入角度为90°时,在体积分数0%～1.0%范围内,Z-pin增强帽型接头拉伸强度随着体积分数的增加而增加,增长趋势随体积分数增加而减缓,含1.0%Zpin增强帽型接头比未增强接头强度提高了31.2%,在体积分数1.0%～1.5%范围内,Z-pin增强帽型接头拉伸强度呈降低趋势;Z-pin直径对帽型接头拉伸强度影响不显著;随着加载跨距的增加,含0.5%（直径0.5mm）Z-pin增强帽型接头伴随有失效模式转变,拉伸强度呈现降低趋势。To enhance the joint strength on interface between the skin and the stiffener of polymer composites＇ hat stiffener wall structure,the 3Dreinforcing technology of Z-pin is used for hat stiffener wall joints.Hat joint specimens reinforced with different configurations of Z-pin are manufactured and tested by tensile,the mechanism reinforced with Z-pin is analyzed and the effects of the volume fraction,diameter of the Z-pin and load span on the joint performance on interface between the skin and the stiffener are investigated.It turns out：when Z-pin＇s diameter is 0.5mm and implant angle is 90°,the joint strength increases with Z-pin volume fraction increasing from 0%to 1.0%,but its increase trend slows down with Z-pin volume fraction increasing,the strength of hat joint with Z-pin fraction of 1.0%is higher than that without Z-pinned by 31.1%,thus the Z-pinned hat joints pull-off strength decreases with Z-pin volume fraction from 1.0%to 1.5%.The effect of the diameter of Z-pin on the pull-off strength of hat joint is not significant.With the increasing of the load span,the pull-off strength of hat joints reinforced with Z-pin fraction of 0.5%（diameter of 0.5mm）decreases with the failure model transforming.

关 键 词：树脂基复合材料 帽型接头 Z-PIN 连接性能 拉伸试验 

分 类 号：TB332[一般工业技术—材料科学与工程]