The intrinsic performance of epoxy adhesives seems to designate them as the ideal solution for assembling certain materials. Pore can have an influence on the load at which the first crack is initiated and on the final strength. In the context of damage tolerance, this work aims to explore the effect of small voids that cannot be detected by conventional non-destructive testing (NDT). To attain this goal, a method based on a criterion coupling strength and toughness is used. 2D finite-element calculations are performed on simple configurations to understand the steps leading to failure when pores are present. When the defects are far from the edges, the loss in load at the initiation of the first crack is a function of the minimum distance between two pores. When the location of the defect interacts with the stress concentration due to a free edge, this loss is a function of the minimum spacing between pores and the free edge. The knock-down factor on the load at failure for a bonded joint with epoxy adhesives remains small (close to the defect area divided by the total area of the bondline). The presence of pores may change the fracture surface (from an adhesive one without pore to a cohesive one with pores).

环氧粘合剂的内在性能似乎将它们指定为组装某些材料的理想解决方案。孔隙会对初始裂纹产生时的载荷和最终强度产生影响。在损伤容限的背景下，这项工作旨在探索传统无损检测 (NDT) 无法检测到的小空隙的影响。为了达到这个目标，使用了一种基于耦合强度和韧性准则的方法。二维有限元计算是在简单的配置上执行的，以了解当存在孔隙时导致故障的步骤。当缺陷远离边缘时，第一个裂纹开始时的载荷损失是两个孔之间最小距离的函数。当缺陷位置与自由边缘引起的应力集中相互作用时，该损失是孔隙和自由边缘之间的最小间距的函数。对于使用环氧树脂粘合剂的粘合接头，失效载荷的击倒系数仍然很小（接近缺陷面积除以粘合层的总面积）。孔隙的存在可能会改变断裂表面（从没有孔隙的粘性表面到有孔隙的粘性表面）。