Fatigue life prediction of adhesive joints is a concern when using this bonding technique in structural components where the joints are subjected to multiaxial stress states. Thus, the development of a fatigue failure criterion that accounts for the effect of mode mixity is crucial. The main aim of the present study is to develop a fatigue model to be able to predict the fatigue life of an epoxy-based adhesive loaded at different mode mixities. For this purpose, Arcan joints were manufactured and tested in pure modes (I and II), and mixed mode loading conditions. Using the obtained experimental data for pure mode loading conditions, a master S-N curve was constructed based on a proposed effective stress. According to this curve and by considering the numerical simulations, the fatigue lives of the joints under mixed mode conditions were estimated. Two different relations (Basquin and Stromeyer) were considered in this study. The influence of the number of load levels considered for the master curve was also analysed. It was found that more experimental results for the reference samples do not necessarily lead to a better estimation. Results show a good agreement between the experimental data and the predicted fatigue lives based on the proposed model.

当在接头受到多轴应力状态的结构部件中使用这种粘结技术时，胶粘接头的疲劳寿命预测是一个问题。因此，制定一种解释模式混合效应的疲劳破坏准则至关重要。本研究的主要目的是开发一种疲劳模型，以能够预测在不同模式混合下负载的环氧基胶的疲劳寿命。为此，在纯模式（I和II）和混合模式加载条件下制造和测试了Arcan接头。使用获得的纯模式载荷条件下的实验数据，基于建议的有效应力构造了主SN曲线。根据该曲线并考虑数值模拟，可以估算出混合模式条件下接头的疲劳寿命。本研究考虑了两种不同的关系（Basquin和Stromeyer）。还分析了主曲线考虑的载荷水平数量的影响。发现参考样品的更多实验结果不一定导致更好的估计。结果表明，基于所提出的模型，实验数据与预测的疲劳寿命之间具有良好的一致性。