Abstract: In actual engineering structures, there are a lot of curved composite structures with large curvature. Due to its special shape and aerodynamic requirements, the patch bonded repair parameters of them can not be simply equated with the planar composite structures. Aiming at the laminate shell structure, for which the size (length×radius×central angle) is 300mm×50mm×PI/3rad and contains a penetration hole of 20mm diameter in the center, two types of composite patch were used to repair it. And then, the mechanism of the laminate shell structures was investigated experimentally. Generally, the hole in the laminate shell structure can reduce a great loss of the failure strength, and the loss rate can reach more than 61%; while the static mechanic properties of the bonded structures are significantly improved. The failure strength and static stiffness of the bonded structures could be the same as the perfect ones. Meanwhile, cuneal patch is beneficial to improve the stress condition of the patch and mother plate in repair structures.

Key words: curved laminate, shell structure, adhesive bonded patch repair, experimental analysis