单搭接结构胶接头连接效率的影响因素分析

A Study on the Factors Affecting the Connection Efficiency of Single Lap Structural Adhesive Join

对单搭接结构胶接头进行拉伸试验,同时建立其有限元模型进行仿真,对单搭接结构胶接头连接效率的影响因素、接头两端刚度的差异对接头连接效率的影响进行分析。结果表明:对于钢材与铝材之间的结构胶连接,随着母材材料屈服强度的增大,接头连接效率不断提高,但当母材屈服强度增加到一定值后,接头连接效率反而呈现下降的趋势;与钢材相比,接头连接效率对铝材屈服强度更为敏感。接头连接效率也随接头几何尺寸(母材厚度、接头搭接长度和搭接宽度)的增加而提高。而对于两端刚度不同的结构胶连接,接头连接效率随着其两端刚度差异的加大而降低,因此为提高接头的连接效率,应尽量选用屈服极限相近的母材。

The tensile test of single lap structural adhesive joint is conducted,meanwhile its finite element model is built with corresponding simulation perl＇ormed to analyze the factors affecting the connection efficiency of single lap structural adhesive joint,in particular, the effects of stiffness discrepancy in both ends of joint on the connection efficiency of joint. The results show that for structural adhesive joint between steel and aluminum,the connection efficiency of joint rises with the increase of the yield strength of base metals, but when the yield strength of base metals further increase beyond a certain value,the connection efficiency of joint exhibits a trend of decline. Compared with steel,the connection efficiency of joint is more sensitive to the yield strength of aluminum ,and the connection efficiency of joint also enhances with the increase of the geometric dimensions of joint （the thickness of base metal and the lap length and width of joint）. For structural adhesive joint with different stiffness in both ends, the connection efficiency of joint declines with the increase of stiffness difference in both ends. As a result,for enhancing the connection efficiency of joint,the base metals with as close yield strength as possible should be chosen.