Aluminium alloy is a commonly used material in the superstructure of naval vessels. This alloy is prone to sensitisation when exposed to the marine environment for an extended period, which leads to the formation of stress corrosion cracks. Because welding is unsuitable for repairing sensitised aluminium alloy with cracks, this study used carbon-fibre-reinforced plastic (CFRP) patches for repair. The repair effect of CFRP patches was examined through experiments and numerical simulation to clarify the mechanical properties of cracked aluminium alloy repaired with CFRP patches. The experimental results revealed that the tensile strength of cracked aluminium alloy was increased by 40% after its repair with a CFRP patch, and the obtained tensile strength was higher than the yielding strength of this alloy. With regard to numerical simulation, this study employed the extended finite-element method (XFEM) and traction-separation law to simulate crack propagation in cracked aluminium alloy and the bonding strength at the repair interface. The numerical simulation results were consistent with the experimental results, which confirmed that the established numerical model accurately captures the failure trends and ultimate strength of cracked aluminium alloy repaired with a CFRP patch. Future researchers can use the numerical simulation method established in this study to predict the effectiveness of using CFRP patches in the repair of naval vessel superstructures.

铝合金是海军舰艇上层建筑常用的材料。这种合金长期暴露在海洋环境中容易发生敏化，从而导致应力腐蚀裂纹的形成。由于焊接不适合修复有裂纹的敏化铝合金，因此本研究使用碳纤维增强塑料（CFRP）补片进行修复。通过实验和数值模拟检验CFRP补片的修复效果，明确CFRP补片修复裂纹铝合金的力学性能。实验结果表明，采用CFRP补片修复裂纹铝合金后，其抗拉强度提高了40%，且获得的抗拉强度高于该合金的屈服强度。在数值模拟方面，本研究采用扩展有限元法（XFEM）和牵引分离法来模拟裂纹铝合金中的裂纹扩展和修复界面的结合强度。数值模拟结果与实验结果一致，证实所建立的数值模型准确地捕捉了CFRP补片修复裂纹铝合金的失效趋势和极限强度。未来的研究人员可以利用本研究建立的数值模拟方法来预测使用CFRP补片修复海军舰艇上层建筑的有效性。