Z-pin参数对复合材料T型接头拉脱承载能力的影响  

Effect of Z-pin parameters on pull-off carrying capacity of composite T-joints

作　　者：李梦佳[1] 陈普会[1] 孔斌[2] 彭涛[2] 姚正兰 邱学仕[2] 

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室,南京210016 [2]成都飞机设计研究所,成都610091

出　　处：《复合材料学报》2015年第2期571-578,共8页Acta Materiae Compositae Sinica

基　　金：江苏高校优势学科建设工程

摘　　要：利用二维平面应变模型对Z-pin增强T型接头试样进行失效分析,采用内聚力模型模拟界面的破坏情况,通过在分层的上下界面加入非线性弹簧元模拟Z-pin的增强作用,非线性弹簧元的力学性能(桥联律)由细观力学方法获得,数值结果与试验值吻合较好。在已验证有限元方法的基础上,研究了Z-pin直径、密度及植入角度等对T型接头拉脱承载能力的影响。结果表明:Z-pin增强可显著提高T型接头的拉脱承载能力,与未Z-pin增强的T型接头相比,Z-pin增强明显延缓了掉载;T型接头的拉脱承载能力随Z-pin直径和密度的增加而增大,随植入角度的增大而减小;在所研究的角度范围内,当植入角度为60°时,T型接头的拉脱承载能力最好;Z-pin直径和密度对拉脱承载能力的影响远比植入角度的影响显著。Two-dimensional plane strain models were used to analyze the failure of Z-pin reinforced T-joint specimens.The cohesive zone model was used to simulate the interface failure,and the reinforcement effect of Z-pin was simulated by the inserting of nonlinear springs into the upper and lower interfaces of delamination.The mechanical properties(bridging law)of nonlinear spring were obtained by micromechanical approach.The numerical results agree well with the testing values.Based on the verified finite element method,the effects of the diameter,density and inserting angle et al of Z-pin on the pull-off carrying capacity of T-joints were studied.Results show that Z-pin reinforcement can effectively improve the pull-off carrying capacity of T-joints and delay the decrease of the load after peak loading significantly compared to the T-joints before Z-pin reinforcement.The pull-off carrying capacity of T-joint increases as the diameter and density of Z-pin increase and decreases as the inserting angle of Z-pin increases.In the angle range investigated,the pull-off carrying capacity of T-joints reaches the best when the inserting angle is60°.The effect of diameter and density of Z-pin on pull-off carrying capacity is much more significant than that of inserting angle.

关 键 词：复合材料 T型接头 Z-PIN 非线性弹簧 桥联律 

分 类 号：TB332[一般工业技术—材料科学与工程]