Z-pin增强树脂基复合材料单搭接连接性能  

Performance of Polymer Composite Single Lap Joints Reinforced by Z-pin

作　　者：董晓阳[1] 李勇[1] 张向阳[1] 肖军[1] 李吻[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京210016

出　　处：《航空学报》2014年第5期1302-1310,共9页Acta Aeronautica et Astronautica Sinica

基　　金：军品配套项目(JPPT-1146)~~

摘　　要：为提高复合材料单搭接头的连接性能,制备了不同参数的Z-pin增强单搭接头,通过拉伸试验,研究了Z-pin体积分数、直径以及植入角度对单搭接头连接性能的影响规律,分析了Z-pin对单搭接头性能的增强机理.结果表明Z-pin能明显提高复合材料单搭接头的连接性能：植入角度为90°、Z-pin直径为0.5 mm时,在0％～3.0％体积分数范围内,单搭接头强度随着Z-pin体积分数的增加呈线性增加,含3.0％Z-pin的接头剪切强度为16.76 MPa,比无Z-pin的接头强度提高了33.2％;Z-pin体积分数为1.5％、植入角度为90°时,Z-pin直径变化对单搭接头强度影响不大;含Z-pin体积分数为1.5％、直径为0.5 mm时,随着Z-pin植入角度（背离搭接末端）的增加,单搭接头强度先增加后下降,失效模式从Z-pin拔出失效转变为Z-pin剪断失效;在植入角度为40°时,剪切强度最大（21.04 MPa）,比无Z-pin的接头剪切强度提高了67.1％.Z-pin植入角度（倾向于搭接末端）对单搭接头强度无影响.To enhance the performance of polymer composite single lap joints,the joints reinforced with different configurations of Z-pins are manufactured and tested.The effects of the volume fraction,diameter and implant angles of the Z-pins on the strength of single lap joints are investigated and their reinforcing mechanism is also analyzed.The study finds that the Z-pin can improve the performance of single lap joints significantly：When the Z-pin’s diameter is 0.5 mm and the implant angle is 90°,the joint＇s strength increases linearly with the Z-pin volume fraction from 0 ％ to 3.0 ％.The maximum strength is 16.76 MPa with a 3.0％ Z-pin fraction,which is 33.2％ higher than that without Z-pin.It also reveals that the Z-pin’s diameter has little influence on the strength of polymer composite single lap joints while the Z-pin fraction is 1.5％ and the angle is 90°.The strength and failure model is strongly dominated by the implant angles of the Z-pin （against the joint edge） for a Z-pin fraction of 1.5％ with a diameter of 0.5 mm.With the increase of the implant angles,the failure mode of the joint is transformed from Z-pin pulling out to Z-pin shearing.The strength reaches its peak value of 21.04 MPa at 40°,which is 67.1％ higher than that without Z-pin.The implant angles of the Z-pin （along the joint edge） have no influence on its strength and failure mode.

关 键 词：树脂基复合材料 单搭接头 Z-PIN增强 连接性能 拉伸试验 

分 类 号：V258[一般工业技术—材料科学与工程] TB332[航空宇航科学与技术—航空宇航制造工程]