In the paper, detailed numerical comparisons are considered for the mixed-mode failure characteristics of different composite adhesively bonded joints with brittle/quasi-brittle adhesive using following failure models: cohesive zone model (CZM), virtual crack closure technology (VCCT), mixed-mode continuum damage model (MCDM) and finite fracture mechanics (FFM). Detailed numerical comparisons contain the stress and energy, and crack propagation near a crack tip with mode mixity when the adhesively bonded joint made of unidirectional carbon fiber reinforced composite adherend (SEAL® Texipreg HS 160 RM) and brittle adhesive AV138 is subjected to the mixed-mode load. The traction-separation law assumes the bilinear cohesive law to model the brittle/quasi-brittle adhesive and the quadratic stress criterion and B-K energy failure criterion are used. Also, an alternative numerical formulation of FFM is considered for the prediction of failure characteristics in the composite single lap joint. Moreover, the sensitivity analysis is performed to account the effect of parameters in the coupled FFM criteria, using four parameters. Next, predicted failure loads are compared with results in previous references for various types of adhesively bonded joints such as double lap joint (DLJ), scarf joint and single-L joint. Finally, the effect of constraint due to adherend bending is analyzed with varying the adhesive thickness, leading to more accurate prediction of failure load.

在本文中，使用以下失效模型对不同脆性/准脆性粘合剂复合材料胶接接头的混合模式失效特性进行了详细的数值比较：内聚区模型（CZM）、虚拟裂纹闭合技术（VCCT）、混合-模式连续损伤模型 (MCDM) 和有限断裂力学 (FFM)。当由单向碳纤维增强复合材料被粘物 (SEAL® Texipreg HS 160 RM) 和脆性粘合剂 AV138 制成的粘合接头受到混合时，详细的数值比较包含应力和能量，以及裂纹尖端附近的裂纹扩展与模式混合。模式负载。牵引分离定律假定双线性内聚定律对脆性/准脆性粘合剂进行建模，并使用二次应力准则和 BK 能量破坏准则。此外，还考虑了 FFM 的替代数值公式来预测复合单搭接接头的失效特征。此外，使用四个参数进行敏感性分析以考虑耦合 FFM 标准中参数的影响。接下来，将预测的失效载荷与先前参考文献中各种类型的胶接接头（例如双搭接接头 (DLJ)、斜接接头和单 L 接头）的结果进行比较。最后，通过改变粘合剂厚度来分析由于被粘物弯曲引起的约束效果，从而更准确地预测失效载荷。执行敏感性分析以考虑耦合 FFM 标准中参数的影响，使用四个参数。接下来，将预测的失效载荷与先前参考文献中各种类型的胶接接头（例如双搭接接头 (DLJ)、斜接接头和单 L 接头）的结果进行比较。最后，通过改变粘合剂厚度来分析由于被粘物弯曲引起的约束效果，从而更准确地预测失效载荷。使用四个参数执行敏感性分析以考虑耦合的FFM标准中参数的影响。接下来，将预测的失效载荷与先前参考文献中各种类型的胶接接头（例如双搭接接头 (DLJ)、斜接接头和单 L 接头）的结果进行比较。最后，通过改变粘合剂厚度来分析由于被粘物弯曲引起的约束效果，从而更准确地预测失效载荷。