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长期温度、湿度和载荷作用会改变单搭接接头的失效模式,引起界面失效。为了研究界面失效位置和面积对单搭接接头失效的影响,基于内聚力模型建立了单搭接接头的仿真分析模型,分析了单边、双边、三边和四边界面失效共八种情况下,粘接接头的失效载荷和应力分布变化规律。研究结果表明:所有接头的失效载荷下降幅度,均随着界面失效面积比例增加呈线性增长趋势;当界面失效改变了单搭接接头的对称性,会导致胶层应力分布对称性和应力均匀性降低,造成接头失效载荷的下降幅度增加。采用回归分析方法获得了近似函数关系,能够对任意界面失效位置和面积下的单搭接接头失效载荷进行预测,并验证了预测精度。
Abstract：The long-term temperature,humidity and load will change the failure mode of single lap joint,resulting in the interface failure.In order to study the influence of interface failure location and area on the failure of single lap joint,a simulation analysis model of single lap joint was established based on cohesive force mode.The failure load and stress distribution of bonded joint under 8 kinds of interface failure,including unilateral,bilateral,trilateral and quadrilateral,were analyzed.The research results showed that the failure load of all joints declined linearly with the increase of interface failure area ratio.When the symmetry of single lap joint was changed by interface failure,the stress distribution symmetry and stress uniformity of adhesive layer were reduced,and the decrease range of joint failure load was increased.The approximate function relationship was obtained by regression analysis method,which could predict the failure load of single lap joint under any interface failure location and area,and the prediction accuracy was verified.
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基本信息:
DOI：10.13416/j.ca.2020.09.002
中图分类号:TG49
引用信息:
[1]秦国锋,黄春阳,糜沛纹等.界面失效对单搭接粘接接头失效的影响及其预测方法[J].中国胶粘剂,2020,29(09):1-7.DOI:10.13416/j.ca.2020.09.002.
基金信息:
国家自然科学基金项目（51775230）; 广西科技基地和人才专项（桂科AD20159010）