Z-pin/缝合对复合材料T型接头剪切承载能力的影响  

Effect of Z-pin/stitching on the shear carrying capacity of composite T-joints

作　　者：孔斌[1,2] 陈普会 李梦佳[1] 彭涛[2] 姚正兰 邱学仕 KONG Bin;CHEN Puhui;LI Mengjia;PENG Tao;YAO Zhenglan;QIU Xueshi(State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;Chengdu Aircraft Design and Research Institute, Aviation Industry Comporation of China, Ltd. , Chengdu 610091, China)

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]中国航空工业集团公司成都飞机设计研究所,成都610091

出　　处：《复合材料学报》2018年第4期834-842,共9页Acta Materiae Compositae Sinica

基　　金：江苏高校优势学科建设工程资助项目

摘　　要：利用三维有限元模型对Z-pin/缝合增强试验件进行有限元分析,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来模拟Z-pin/缝合的增强机制,非线性弹簧元的力学性能(桥联律)由细观力学方法获得。通过与试验结果的对比发现,由于未进行界面增强的T型结构的剪切承载能力已较高,Zpin/缝合增强较难提高T型接头的剪切承载能力。从少数几种可提高T型接头的剪切承载能力的增强方案中可看到,应选择拉伸强度较高而拉伸模量较低的缝线来进行T型接头剪切界面增强设计。Three-dimensional FEM models were used to simulate the Z-pin/stitching reinforced T-joint specimens.The interface failure was simulated with cohesive zone model,and the effect of Z-pin/stitching was simulated with nonlinear springs inserted into the interface.The mechanical properties of the spring,i.e.bridging law,were obtained based on a micromechanical approach.Comparing with experimental results and the FEM results,it is difficult to increase the shear carrying capacity of T-joints through Z-pin/stitching as the shear carrying capacity of unreinforced T-joint is quite high already.After analyzing the a few schemes which can increase the shear carrying capacity of T-joints,choosing stitch with high tensile strength and low tensile modulus was suggested to be used for the design of interface reinforcement.

关 键 词：复合材料 T型接头 Z-PIN 缝合 非线性弹簧 

分 类 号：V214.8[航空宇航科学与技术—航空宇航推进理论与工程] TB332[一般工业技术—材料科学与工程]