Mechanical behavior and fracture characteristics of adhesively bonded and hybrid bonded-riveted repairs with stepped single-side and double-side configurations were investigated. Digital image correlation (DIC) technique was used to systematically investigate the effects of repair configuration and repair method on full-field strain distribution and damage evolution process of CFRP-repaired steel structures under static loading. The strain distribution and evolution in the repairs were quantified to figure out failure process and fracture characteristics in details. The failure process of hybrid repairs displayed two stages including initial adhesive failure and final rivet shearing, and the behavior of rivets could prevent catastrophic failure of CFRP-repaired steel structures. Progressive failure process of different repairs indicated that crack initiated and propagated on the edge of repaired region between CFRP laminates and substrates, which was in good agreement with the findings from strain distribution. Mixed failure modes including adhesive failure, thin-layer cohesive failure, light-fiber-tear failure, stock-break/delamination and rivet shearing were identified for specific repairs.

研究了单侧和双侧阶梯型粘结粘结和混合粘结铆接修复的力学性能和断裂特性。利用数字图像相关技术（DIC）系统研究了修复结构和修复方法对CFRP修复钢结构在静载荷下全场应变分布和损伤演化过程的影响。量化修复过程中的应变分布和演变，以详细了解破坏过程和断裂特征。混合修复的失效过程包括初始粘合失效和最终铆钉剪切两个阶段，并且铆钉的行为可以防止CFRP修复的钢结构的灾难性失效。不同修复的渐进破坏过程表明，裂纹在CFRP层压板和基底之间的修复区域边缘开始并扩展，这与应变分布的发现非常吻合。确定了混合破坏模式，包括粘合破坏，薄层内聚破坏，光纤维撕裂破坏，断头/分层和铆钉剪切，以进行具体维修。