为研究循环载荷下单搭胶接接头的残余强度及失效机理，以5052铝合金单搭胶接接头为研究对象，先后对其进行静强度测试、疲劳强度测试和残余强度测试，引入威布尔分布对试验数据进行分析，检验其有效性，并采用超声扫描显微镜和扫描电子显微镜对失效胶层进行失效机理分析。结果表明，在疲劳循环载荷作用下，接头刚度基本稳定，而残余强度随着疲劳循环载荷周次的增加，呈现出先增大后减小的变化趋势；疲劳裂纹从接头搭接端部的界面端点处开始萌生，并快速向中间扩展，当疲劳循环达到一定次数时，胶层瞬间断裂，裂纹萌生阶段几乎占据了其全部疲劳寿命，失效后的胶层会出现“凹台”状微观结构。
In order to research the residual strength and failure mechanism of adhesive bonding of single lap joints (SLJs)whose adherend was 5052 aluminum alloy under the cyclic load.The adhesive bonding of SLJs were se-parately tested under tension-shear load and fatigue load,the effectiveness of experimental data was analyzed by weibull distribution.The results show that the residual strength and failure mode of adhesive joints were influenced by the cyclic loading.The residual strength of adhesive joints first increased and then decreased with the cyclic loading in-creasing.The formation of the main crack expended most of the whole fatigue life of adhesive joints,and once the main crack formed,the crack propagated rapidly and fractured immediately.The fatigue failure surface of adhesive is pocked with “concave platform”structures.
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