【作者】 郑锡涛； 郭英男； 田薇； 柴亚南； 李新祥；

【Author】 Zheng Xitao~1,Guo Yingnan~1,Tian Wei~1,Chai Yanan~2,Li Xinxiang~2 (1 School of Aeronautics,Northwestern Polytechnical University,Xi’an,Shaanxi 710072; 2 Aircraft Strength Research Institute,Xi’an,Shaanxi 710065)

【机构】 西北工业大学航空学院； 中国飞机强度研究所；

【摘要】 针对三维四向编织复合材料单耳承力接头,采用细观力学和均匀化方法分析了三维编织复合材料的细观结构,进而采用MATLAB程序对复合材料弹性性能进行参数化求解,利用ANSYS估算了两种试样的破坏载荷。有限元计算结果与试验值有较好的吻合,显示本方法可以满足工程设计和分析。更多还原

【Abstract】 Load response and failure modes of three-dimensional four-directional braided composite lugs were studied analytically and experimentally.The objective of the study was to get information on the stiffness,strength and failure mode of the lug,as well as on the applicability of the analysis method used to predict lug load response and failure.The analyses were performed using finite dement method.Parabolic solid brick elements were used.A steel pin was modeled to apply the loading.The loading was applied with a constant force distribution through the center of the pin.A contact was defined between the pin and the surrounding lug surface.The test lugs were manufactured with the Resin Transfer Molding(RTM) technique.The test specimens were loaded parallel to the lug centerline.Two types of specimens were tested.There are three basic failure modes in braided composite joints:net-tension,shear-out,and bearing.Net-tension failure is associated with matrix and fiber tension failure due to stress concentrations.Shear-out and bearing failures result primarily from the shear and compression failures of fiber and matrix.The measured strains showed fairly good correlation with the analysis results.The strain response was almost linear. It can be concluded that with correct material properties the FE approach used in the analyses can provide a reasonable estimate for the load response and failure of 3 - D braided composite lugs.更多还原