新型金属/复合材料混合连接结构试验研究

为提高金属与复合材料混合连接结构的力学性能,提出一种金属与复合材料之间的新型连接方法。通过在金属与复合材料搭接区铺设胶膜,同时嵌入若干贯穿被连接件的金属细针,从而使得胶膜与细针共同传递被连接件之间的载荷。为探明和揭示该新型连接方法的优越性,制作了相应的试验件并开展了力学性能测试。通过分析试验过程中的载荷-位移关系以及试验件破坏模式,发现新型连接方法显著提高了金属与复合材料连接结构的破坏载荷、破坏应变及能量吸收能力。若将该新型连接方法应用于航空航天工程,将提高复合材料连接结构的承载效率,降低结构重量。此外,该连接方法还降低了接头破坏的突发性,从而有利于结构缺陷的检测。

Experimental Investigation on Hybrid Structure of Novel Metal to Composite

A novel joint method is developed to improve the mechanical properties of the metal-composite hybrid joints, which is called adhesive-multi pin joint method. Both the adhesive between the metallic and composite substrates and some very thin metallic pins running through the substrates in the overlap area transfer the load in this new joint. Ten-sile test of metal-composite joints made by traditional adhesive bonded method and new joint method were carried out for comparison. The results demonstrated that the failure load, failure strain, and energy absorption capacity can be improved significantly by the proposed joint method, in addition to that, it can decrease the suddenness of the failure of the joint. All these indications of damage occurring to a joint could promote detection of a problem in a structure before the catastrophic failure. The application of the new joint method in aerospace engineering will increase the bearing efficiency and reduce the weight of composite joint structures. The applicability of the adhesive-multi pin joint is wider than adhesive joint because of these excellent properties.