作　　者： ; ; ;

机构地区： 天津大学机械工程学院

出　　处： 《复合材料学报》 2009年第3期182-187,共6页

摘　　要： 在复合材料单搭接头的加工过程中,在搭接区端部会形成一些细观结构,从而在这些区域常存在比较严重的应力集中。应用实验和有限元方法研究了胶瘤和复合材料端部毛刺这2种搭接区端部细观结构对受拉复合材料层合板单搭接头力学响应的影响。应用数字图像相关方法测量了搭接区端部的应变场分布情况,同时利用基于子模型技术的非线性有限元方法分析了搭接区端部细观结构的作用。实验结果与有限元分析结果吻合较好。实验和有限元结果都表明胶瘤分担了部分载荷,可以降低搭接区端部的应力集中。复合材料端部毛刺的作用与毛刺的具体结构关系密切,不同结构的毛刺对搭接区端部应力应变分布的影响是不同的。 In the manufacturing procedure of composite single-lap joints, some mesostruetures often form at the overlap ends. Because there are severe strain/stress concentrations at the overlap ends, these mesostructures may have effects on the mechanical performance of the joints. The effects of mesostruetures at the overlap ends, including resin fillets and composite bulges, on the mechanical response of adhesively bonded laminated composite single-lap joints under tensile load were investigated by experimental measurement and finite element analysis. By digital image correlation technique, the strain distributions at the overlap end were measured. A nonlinear finite element analysis based on the submodel technique was executed to analyze the functions of the mesostruetures at the overlap ends. The results from experimental measurement are in reasonable agreement with the finite element analysis. The results from experimental measurements and finite element analysis indicate that resin fillets at the overlap ends could carry a portion of load so that the strain/stress concentrations at the overlap ends are reduced. The functions of composite bulges are related to their own structures, so their effects are different for different composite bulges.

关 键 词： 接头 有限元分析 应力集中 力学测试 光学显微术

领　　域： [一般工业技术] [航空宇航科学与技术] [航空宇航科学技术]